31233221031 has 16 divisors (see below), whose sum is σ = 41736578688. Its totient is φ = 20776044000.

The previous prime is 31233221027. The next prime is 31233221077. The reversal of 31233221031 is 13012233213.

It is not a de Polignac number, because 31233221031 - 2² = 31233221027 is a prime.

It is a super-2 number, since 2×31233221031² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31233220989 and 31233221007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31233221081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5017501 + ... + 5023721.

It is an arithmetic number, because the mean of its divisors is an integer number (2608536168).

Almost surely, 2^31233221031 is an apocalyptic number.

31233221031 is a deficient number, since it is larger than the sum of its proper divisors (10503357657).

31233221031 is a wasteful number, since it uses less digits than its factorization.

31233221031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9662.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31233221031 its reverse (13012233213), we get a palindrome (44245454244).

The spelling of 31233221031 in words is "thirty-one billion, two hundred thirty-three million, two hundred twenty-one thousand, thirty-one".