1331031131220 has 96 divisors (see below), whose sum is σ = 4275873116928. Its totient is φ = 303051866112.

The previous prime is 1331031131189. The next prime is 1331031131231. The reversal of 1331031131220 is 221311301331.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 6057667 + ... + 6273546.

It is an arithmetic number, because the mean of its divisors is an integer number (44540344968).

Almost surely, 2^{1331031131220} is an apocalyptic number.

1331031131220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331031131220 is an abundant number, since it is smaller than the sum of its proper divisors (2944841985708).

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

1331031131220 is a wasteful number, since it uses less digits than its factorization.

1331031131220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12331489 (or 12331487 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 1331031131220 its reverse (221311301331), we get a palindrome (1552342432551).

The spelling of 1331031131220 in words is "one trillion, three hundred thirty-one billion, thirty-one million, one hundred thirty-one thousand, two hundred twenty".