2131321668 has 24 divisors (see below), whose sum is σ = 5683524672. Its totient is φ = 608949024.

The previous prime is 2131321649. The next prime is 2131321691. The reversal of 2131321668 is 8661231312.

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, 12686355 + ... + 12686522.

It is an arithmetic number, because the mean of its divisors is an integer number (236813528).

Almost surely, 2^2131321668 is an apocalyptic number.

2131321668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2131321668 is an abundant number, since it is smaller than the sum of its proper divisors (3552203004).

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

2131321668 is a wasteful number, since it uses less digits than its factorization.

2131321668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25372891 (or 25372889 counting only the distinct ones).

The product of its digits is 10368, while the sum is 33.

The square root of 2131321668 is about 46166.2394829815. The cubic root of 2131321668 is about 1286.9144185710.

The spelling of 2131321668 in words is "two billion, one hundred thirty-one million, three hundred twenty-one thousand, six hundred sixty-eight".