31221022133 has 24 divisors (see below), whose sum is σ = 37396639800. Its totient is φ = 25970087808.

The previous prime is 31221022127. The next prime is 31221022163. The reversal of 31221022133 is 33122012213.

It can be written as a sum of positive squares in 4 ways, for example, as 16443702289 + 14777319844 = 128233^2 + 121562^2 .

It is not a de Polignac number, because 31221022133 - 2²⁴ = 31204244917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221022163) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 683123 + ... + 727391.

It is an arithmetic number, because the mean of its divisors is an integer number (1558193325).

Almost surely, 2^31221022133 is an apocalyptic number.

It is an amenable number.

31221022133 is a deficient number, since it is larger than the sum of its proper divisors (6175617667).

31221022133 is a wasteful number, since it uses less digits than its factorization.

31221022133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44709 (or 44702 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31221022133 its reverse (33122012213), we get a palindrome (64343034346).

The spelling of 31221022133 in words is "thirty-one billion, two hundred twenty-one million, twenty-two thousand, one hundred thirty-three".