23210000021 has 4 divisors (see below), whose sum is σ = 24995384652. Its totient is φ = 21424615392.

The previous prime is 23210000003. The next prime is 23210000053. The reversal of 23210000021 is 12000001232.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12794776996 + 10415223025 = 113114^2 + 102055^2 .

It is a cyclic number.

It is not a de Polignac number, because 23210000021 - 2²² = 23205805717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23209999957 and 23210000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23210000071) 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, 892692296 + ... + 892692321.

It is an arithmetic number, because the mean of its divisors is an integer number (6248846163).

Almost surely, 2^23210000021 is an apocalyptic number.

It is an amenable number.

23210000021 is a deficient number, since it is larger than the sum of its proper divisors (1785384631).

23210000021 is a wasteful number, since it uses less digits than its factorization.

23210000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785384630.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 23210000021 its reverse (12000001232), we get a palindrome (35210001253).

The spelling of 23210000021 in words is "twenty-three billion, two hundred ten million, twenty-one", and thus it is an aban number.