31131121020012 has 36 divisors (see below), whose sum is σ = 84745829444640. Its totient is φ = 9578806467552.

The previous prime is 31131121020001. The next prime is 31131121020047. The reversal of 31131121020012 is 21002012113113.

31131121020012 is a `hidden beast` number, since 311 + 31 + 121 + 0 + 200 + 1 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33259744212 + ... + 33259745147.

Almost surely, 2^{31131121020012} is an apocalyptic number.

It is an amenable number.

31131121020012 is an abundant number, since it is smaller than the sum of its proper divisors (53614708424628).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31131121020012 is a wasteful number, since it uses less digits than its factorization.

31131121020012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66519489382 (or 66519489377 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 31131121020012 its reverse (21002012113113), we get a palindrome (52133133133125).

The spelling of 31131121020012 in words is "thirty-one trillion, one hundred thirty-one billion, one hundred twenty-one million, twenty thousand, twelve".