23742921 has 4 divisors (see below), whose sum is σ = 31657232. Its totient is φ = 15828612.

The previous prime is 23742881. The next prime is 23742997. The reversal of 23742921 is 12924732.

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 not a de Polignac number, because 23742921 - 2⁹ = 23742409 is a prime.

It is a super-2 number, since 2×23742921² = 1127452595224482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23742821) 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, 3957151 + ... + 3957156.

It is an arithmetic number, because the mean of its divisors is an integer number (7914308).

Almost surely, 2^23742921 is an apocalyptic number.

It is an amenable number.

23742921 is a deficient number, since it is larger than the sum of its proper divisors (7914311).

23742921 is an equidigital number, since it uses as much as digits as its factorization.

23742921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7914310.

The product of its digits is 6048, while the sum is 30.

The square root of 23742921 is about 4872.6708282009. The cubic root of 23742921 is about 287.4162922024.

The spelling of 23742921 in words is "twenty-three million, seven hundred forty-two thousand, nine hundred twenty-one".