31331212033121 has 16 divisors (see below), whose sum is σ = 42067081891968. Its totient is φ = 22535936726400.

The previous prime is 31331212033111. The next prime is 31331212033211. The reversal of 31331212033121 is 12133021213313.

It is a cyclic number.

It is not a de Polignac number, because 31331212033121 - 2¹⁸ = 31331211770977 is a prime.

It is a super-2 number, since 2×31331212033121² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31331212033111) 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, 15649955060 + ... + 15649957061.

It is an arithmetic number, because the mean of its divisors is an integer number (2629192618248).

Almost surely, 2^{31331212033121} is an apocalyptic number.

It is an amenable number.

31331212033121 is a deficient number, since it is larger than the sum of its proper divisors (10735869858847).

31331212033121 is a wasteful number, since it uses less digits than its factorization.

31331212033121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31299912152.

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 31331212033121 its reverse (12133021213313), we get a palindrome (43464233246434).

The spelling of 31331212033121 in words is "thirty-one trillion, three hundred thirty-one billion, two hundred twelve million, thirty-three thousand, one hundred twenty-one".