31233311020121 has 16 divisors (see below), whose sum is σ = 36455217384960. Its totient is φ = 26201422484160.

The previous prime is 31233311020111. The next prime is 31233311020169. The reversal of 31233311020121 is 12102011333213.

It is a de Polignac number, because none of the positive numbers 2^k-31233311020121 is a prime.

It is a super-2 number, since 2×31233311020121² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31233311020111) 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, 23119691 + ... + 24433311.

It is an arithmetic number, because the mean of its divisors is an integer number (2278451086560).

Almost surely, 2^{31233311020121} is an apocalyptic number.

It is an amenable number.

31233311020121 is a deficient number, since it is larger than the sum of its proper divisors (5221906364839).

31233311020121 is a wasteful number, since it uses less digits than its factorization.

31233311020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385944.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 31233311020121 its reverse (12102011333213), we get a palindrome (43335322353334).

The spelling of 31233311020121 in words is "thirty-one trillion, two hundred thirty-three billion, three hundred eleven million, twenty thousand, one hundred twenty-one".