23902121 has 4 divisors (see below), whose sum is σ = 23939712. Its totient is φ = 23864532.

The previous prime is 23902103. The next prime is 23902127. The reversal of 23902121 is 12120932.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23902121 is a prime.

It is a super-2 number, since 2×23902121² = 1142622776597282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23902093 and 23902102.

It is not an unprimeable number, because it can be changed into a prime (23902127) 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, 17825 + ... + 19118.

It is an arithmetic number, because the mean of its divisors is an integer number (5984928).

Almost surely, 2^23902121 is an apocalyptic number.

It is an amenable number.

23902121 is a deficient number, since it is larger than the sum of its proper divisors (37591).

23902121 is an equidigital number, since it uses as much as digits as its factorization.

23902121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37590.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 23902121 is about 4888.9795458766. The cubic root of 23902121 is about 288.0572521532.

The spelling of 23902121 in words is "twenty-three million, nine hundred two thousand, one hundred twenty-one".