31220400303021 has 12 divisors (see below), whose sum is σ = 43515769044608. Its totient is φ = 19908661061784.

The previous prime is 31220400303017. The next prime is 31220400303047. The reversal of 31220400303021 is 12030300402213.

It is not a de Polignac number, because 31220400303021 - 2² = 31220400303017 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 (31220400303091) 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, 9836293405 + ... + 9836296578.

Almost surely, 2^{31220400303021} is an apocalyptic number.

It is an amenable number.

31220400303021 is a deficient number, since it is larger than the sum of its proper divisors (12295368741587).

31220400303021 is a wasteful number, since it uses less digits than its factorization.

31220400303021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19672590032 (or 19672590009 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 31220400303021 its reverse (12030300402213), we get a palindrome (43250700705234).

The spelling of 31220400303021 in words is "thirty-one trillion, two hundred twenty billion, four hundred million, three hundred three thousand, twenty-one".