31113120202021 has 16 divisors (see below), whose sum is σ = 36553028899968. Its totient is φ = 26108517758400.

The previous prime is 31113120201973. The next prime is 31113120202039. The reversal of 31113120202021 is 12020202131113.

It is not a de Polignac number, because 31113120202021 - 2³⁹ = 30563364388133 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31113120202021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31113120202051) 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, 8058691 + ... + 11276911.

It is an arithmetic number, because the mean of its divisors is an integer number (2284564306248).

Almost surely, 2^{31113120202021} is an apocalyptic number.

It is an amenable number.

31113120202021 is a deficient number, since it is larger than the sum of its proper divisors (5439908697947).

31113120202021 is a wasteful number, since it uses less digits than its factorization.

31113120202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3285852.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 31113120202021 its reverse (12020202131113), we get a palindrome (43133322333134).

The spelling of 31113120202021 in words is "thirty-one trillion, one hundred thirteen billion, one hundred twenty million, two hundred two thousand, twenty-one".