131220111021 has 16 divisors (see below), whose sum is σ = 177863639808. Its totient is φ = 86028897600.

The previous prime is 131220110999. The next prime is 131220111023. The reversal of 131220111021 is 120111022131.

It is not a de Polignac number, because 131220111021 - 2³³ = 122630176429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131220111023) 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, 888735 + ... + 1025811.

It is an arithmetic number, because the mean of its divisors is an integer number (11116477488).

Almost surely, 2^131220111021 is an apocalyptic number.

It is an amenable number.

131220111021 is a deficient number, since it is larger than the sum of its proper divisors (46643528787).

131220111021 is a wasteful number, since it uses less digits than its factorization.

131220111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142372.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 131220111021 its reverse (120111022131), we get a palindrome (251331133152).

The spelling of 131220111021 in words is "one hundred thirty-one billion, two hundred twenty million, one hundred eleven thousand, twenty-one".