31221013023 has 12 divisors (see below), whose sum is σ = 45770109528. Its totient is φ = 20503351440.

The previous prime is 31221013007. The next prime is 31221013069. The reversal of 31221013023 is 32031012213.

It is not a de Polignac number, because 31221013023 - 2⁴ = 31221013007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31221012987 and 31221013005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221013003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25887468 + ... + 25888673.

It is an arithmetic number, because the mean of its divisors is an integer number (3814175794).

Almost surely, 2^31221013023 is an apocalyptic number.

31221013023 is a deficient number, since it is larger than the sum of its proper divisors (14549096505).

31221013023 is a wasteful number, since it uses less digits than its factorization.

31221013023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51776214 (or 51776211 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31221013023 its reverse (32031012213), we get a palindrome (63252025236).

The spelling of 31221013023 in words is "thirty-one billion, two hundred twenty-one million, thirteen thousand, twenty-three".