23407812021 has 32 divisors (see below), whose sum is σ = 34457702400. Its totient is φ = 14016473280.

The previous prime is 23407812017. The next prime is 23407812031. The reversal of 23407812021 is 12021870432.

It is not a de Polignac number, because 23407812021 - 2² = 23407812017 is a prime.

It is a super-2 number, since 2×23407812021² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 23407812021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23407812031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1282260 + ... + 1300386.

It is an arithmetic number, because the mean of its divisors is an integer number (1076803200).

Almost surely, 2^23407812021 is an apocalyptic number.

It is an amenable number.

23407812021 is a deficient number, since it is larger than the sum of its proper divisors (11049890379).

23407812021 is a wasteful number, since it uses less digits than its factorization.

23407812021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18609.

The product of its (nonzero) digits is 5376, while the sum is 30.

The spelling of 23407812021 in words is "twenty-three billion, four hundred seven million, eight hundred twelve thousand, twenty-one".