2131998920 has 16 divisors (see below), whose sum is σ = 4796997660. Its totient is φ = 852799552.

The previous prime is 2131998901. The next prime is 2131998937. The reversal of 2131998920 is 298991312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2097823204 + 34175716 = 45802^2 + 5846^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26649947 + ... + 26650026.

Almost surely, 2^2131998920 is an apocalyptic number.

2131998920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2131998920 is an abundant number, since it is smaller than the sum of its proper divisors (2664998740).

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

2131998920 is a wasteful number, since it uses less digits than its factorization.

2131998920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53299984 (or 53299980 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 2131998920 is about 46173.5738274611. The cubic root of 2131998920 is about 1287.0507147601.

The spelling of 2131998920 in words is "two billion, one hundred thirty-one million, nine hundred ninety-eight thousand, nine hundred twenty".