23551304021 has 4 divisors (see below), whose sum is σ = 26915776032. Its totient is φ = 20186832012.

The previous prime is 23551304017. The next prime is 23551304069. The reversal of 23551304021 is 12040315532.

It is a happy number.

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 not a de Polignac number, because 23551304021 - 2² = 23551304017 is a prime.

It is a super-4 number, since 4×23551304021⁴ (a number of 43 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23551304071) 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, 1682235995 + ... + 1682236008.

It is an arithmetic number, because the mean of its divisors is an integer number (6728944008).

Almost surely, 2^23551304021 is an apocalyptic number.

It is an amenable number.

23551304021 is a deficient number, since it is larger than the sum of its proper divisors (3364472011).

23551304021 is an equidigital number, since it uses as much as digits as its factorization.

23551304021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3364472010.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 23551304021 its reverse (12040315532), we get a palindrome (35591619553).

The spelling of 23551304021 in words is "twenty-three billion, five hundred fifty-one million, three hundred four thousand, twenty-one".