23021331 has 24 divisors (see below), whose sum is σ = 33558480. Its totient is φ = 14019264.

The previous prime is 23021291. The next prime is 23021333. The reversal of 23021331 is 13312032.

It is not a de Polignac number, because 23021331 - 2⁷ = 23021203 is a prime.

It is a super-2 number, since 2×23021331² = 1059963362023122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23021331.

It is not an unprimeable number, because it can be changed into a prime (23021333) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31041 + ... + 31773.

It is an arithmetic number, because the mean of its divisors is an integer number (1398270).

Almost surely, 2^23021331 is an apocalyptic number.

23021331 is a deficient number, since it is larger than the sum of its proper divisors (10537149).

23021331 is a wasteful number, since it uses less digits than its factorization.

23021331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803 (or 784 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 23021331 is about 4798.0549184018. The cubic root of 23021331 is about 284.4745875253.

Adding to 23021331 its reverse (13312032), we get a palindrome (36333363).

The spelling of 23021331 in words is "twenty-three million, twenty-one thousand, three hundred thirty-one".