131331221220 has 48 divisors (see below), whose sum is σ = 367754869440. Its totient is φ = 35019044736.

The previous prime is 131331221209. The next prime is 131331221233. The reversal of 131331221220 is 22122133131.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 809046 + ... + 957714.

It is an arithmetic number, because the mean of its divisors is an integer number (7661559780).

Almost surely, 2^131331221220 is an apocalyptic number.

131331221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131331221220 is an abundant number, since it is smaller than the sum of its proper divisors (236423648220).

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

131331221220 is a wasteful number, since it uses less digits than its factorization.

131331221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163404 (or 163402 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 131331221220 its reverse (22122133131), we get a palindrome (153453354351).

The spelling of 131331221220 in words is "one hundred thirty-one billion, three hundred thirty-one million, two hundred twenty-one thousand, two hundred twenty".