121031131020 has 24 divisors (see below), whose sum is σ = 338887167024. Its totient is φ = 32274968256.

The previous prime is 121031130989. The next prime is 121031131063. The reversal of 121031131020 is 20131130121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1008592699 + ... + 1008592818.

It is an arithmetic number, because the mean of its divisors is an integer number (14120298626).

Almost surely, 2^121031131020 is an apocalyptic number.

121031131020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121031131020 is an abundant number, since it is smaller than the sum of its proper divisors (217856036004).

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

121031131020 is a wasteful number, since it uses less digits than its factorization.

121031131020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2017185529 (or 2017185527 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 121031131020 its reverse (20131130121), we get a palindrome (141162261141).

The spelling of 121031131020 in words is "one hundred twenty-one billion, thirty-one million, one hundred thirty-one thousand, twenty".