2131321331220 has 48 divisors (see below), whose sum is σ = 5967877771968. Its totient is φ = 568335398400.

The previous prime is 2131321331173. The next prime is 2131321331231. The reversal of 2131321331220 is 221331231312.

It is a congruent number.

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, 1566492 + ... + 2591628.

It is an arithmetic number, because the mean of its divisors is an integer number (124330786916).

Almost surely, 2^{2131321331220} is an apocalyptic number.

2131321331220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2131321331220 is an abundant number, since it is smaller than the sum of its proper divisors (3836556440748).

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

2131321331220 is a wasteful number, since it uses less digits than its factorization.

2131321331220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059800 (or 1059798 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 2131321331220 its reverse (221331231312), we get a palindrome (2352652562532).

The spelling of 2131321331220 in words is "two trillion, one hundred thirty-one billion, three hundred twenty-one million, three hundred thirty-one thousand, two hundred twenty".