21023022031 has 16 divisors (see below), whose sum is σ = 23680051200. Its totient is φ = 18490615200.

The previous prime is 21023022011. The next prime is 21023022047. The reversal of 21023022031 is 13022032012.

It is a cyclic number.

It is not a de Polignac number, because 21023022031 - 2³³ = 12433087439 is a prime.

It is a super-2 number, since 2×21023022031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21023021996 and 21023022014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023022011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2611110 + ... + 2619148.

It is an arithmetic number, because the mean of its divisors is an integer number (1480003200).

Almost surely, 2^21023022031 is an apocalyptic number.

21023022031 is a deficient number, since it is larger than the sum of its proper divisors (2657029169).

21023022031 is a wasteful number, since it uses less digits than its factorization.

21023022031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15750.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21023022031 its reverse (13022032012), we get a palindrome (34045054043).

The spelling of 21023022031 in words is "twenty-one billion, twenty-three million, twenty-two thousand, thirty-one".