23021533421 has 4 divisors (see below), whose sum is σ = 23035328700. Its totient is φ = 23007738144.

The previous prime is 23021533417. The next prime is 23021533429. The reversal of 23021533421 is 12433512032.

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 8744868196 + 14276665225 = 93514^2 + 119485^2 .

It is a cyclic number.

It is not a de Polignac number, because 23021533421 - 2² = 23021533417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23021533429) 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, 6895136 + ... + 6898473.

It is an arithmetic number, because the mean of its divisors is an integer number (5758832175).

Almost surely, 2^23021533421 is an apocalyptic number.

It is an amenable number.

23021533421 is a deficient number, since it is larger than the sum of its proper divisors (13795279).

23021533421 is a wasteful number, since it uses less digits than its factorization.

23021533421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13795278.

The product of its (nonzero) digits is 4320, while the sum is 26.

The spelling of 23021533421 in words is "twenty-three billion, twenty-one million, five hundred thirty-three thousand, four hundred twenty-one".