31121032120020 has 96 divisors (see below), whose sum is σ = 96862351568640. Its totient is φ = 8295396520320.

The previous prime is 31121032119971. The next prime is 31121032120117. The reversal of 31121032120020 is 2002123012113.

31121032120020 is a `hidden beast` number, since 3 + 1 + 121 + 0 + 321 + 200 + 20 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 31121032119975 and 31121032120002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11045032 + ... + 13573311.

It is an arithmetic number, because the mean of its divisors is an integer number (1008982828840).

Almost surely, 2^{31121032120020} is an apocalyptic number.

31121032120020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31121032120020 is an abundant number, since it is smaller than the sum of its proper divisors (65741319448620).

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

31121032120020 is a wasteful number, since it uses less digits than its factorization.

31121032120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24620702 (or 24620694 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31121032120020 its reverse (2002123012113), we get a palindrome (33123155132133).

The spelling of 31121032120020 in words is "thirty-one trillion, one hundred twenty-one billion, thirty-two million, one hundred twenty thousand, twenty".