23303031021 has 28 divisors (see below), whose sum is σ = 34963058880. Its totient is φ = 15524463240.

The previous prime is 23303031007. The next prime is 23303031047. The reversal of 23303031021 is 12013030332.

23303031021 is a `hidden beast` number, since 2 + 330 + 3 + 0 + 310 + 21 = 666.

It is not a de Polignac number, because 23303031021 - 2²⁵ = 23269476589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23303030985 and 23303031003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23303031071) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1105660 + ... + 1126538.

Almost surely, 2^23303031021 is an apocalyptic number.

It is an amenable number.

23303031021 is a deficient number, since it is larger than the sum of its proper divisors (11660027859).

23303031021 is an equidigital number, since it uses as much as digits as its factorization.

23303031021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22428 (or 22413 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 23303031021 its reverse (12013030332), we get a palindrome (35316061353).

The spelling of 23303031021 in words is "twenty-three billion, three hundred three million, thirty-one thousand, twenty-one".