23131030021 has 8 divisors (see below), whose sum is σ = 25478841024. Its totient is φ = 20824050720.

The previous prime is 23131029997. The next prime is 23131030051. The reversal of 23131030021 is 12003013132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 23131030021 - 2¹³ = 23131021829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23131029977 and 23131030004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23131030051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10206736 + ... + 10209001.

It is an arithmetic number, because the mean of its divisors is an integer number (3184855128).

Almost surely, 2^23131030021 is an apocalyptic number.

It is an amenable number.

23131030021 is a deficient number, since it is larger than the sum of its proper divisors (2347811003).

23131030021 is a wasteful number, since it uses less digits than its factorization.

23131030021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20415851.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 23131030021 its reverse (12003013132), we get a palindrome (35134043153).

The spelling of 23131030021 in words is "twenty-three billion, one hundred thirty-one million, thirty thousand, twenty-one".