240121 has 4 divisors (see below), whose sum is σ = 274432. Its totient is φ = 205812.

The previous prime is 240113. The next prime is 240131. The reversal of 240121 is 121042.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 121042 = 2 ⋅60521.

It is a cyclic number.

It is not a de Polignac number, because 240121 - 2³ = 240113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 240098 and 240107.

It is not an unprimeable number, because it can be changed into a prime (240101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17145 + ... + 17158.

It is an arithmetic number, because the mean of its divisors is an integer number (68608).

2²⁴⁰¹²¹ is an apocalyptic number.

It is an amenable number.

240121 is a deficient number, since it is larger than the sum of its proper divisors (34311).

240121 is an equidigital number, since it uses as much as digits as its factorization.

240121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34310.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 240121 is about 490.0214281029. The cubic root of 240121 is about 62.1550921181.

Adding to 240121 its reverse (121042), we get a palindrome (361163).

It can be divided in two parts, 240 and 121, that added together give a square (361 = 19²).

The spelling of 240121 in words is "two hundred forty thousand, one hundred twenty-one", and thus it is an iban number.