31311021130321 has 16 divisors (see below), whose sum is σ = 32982412978944. Its totient is φ = 29688621980544.

The previous prime is 31311021130253. The next prime is 31311021130379. The reversal of 31311021130321 is 12303112011313.

It is a cyclic number.

It is not a de Polignac number, because 31311021130321 - 2¹⁵ = 31311021097553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31311021130292 and 31311021130301.

It is not an unprimeable number, because it can be changed into a prime (31311021130121) 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, 38232555 + ... + 39042928.

It is an arithmetic number, because the mean of its divisors is an integer number (2061400811184).

Almost surely, 2^{31311021130321} is an apocalyptic number.

It is an amenable number.

31311021130321 is a deficient number, since it is larger than the sum of its proper divisors (1671391848623).

31311021130321 is a wasteful number, since it uses less digits than its factorization.

31311021130321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77275800.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 31311021130321 its reverse (12303112011313), we get a palindrome (43614133141634).

The spelling of 31311021130321 in words is "thirty-one trillion, three hundred eleven billion, twenty-one million, one hundred thirty thousand, three hundred twenty-one".