2118971904 has 80 divisors (see below), whose sum is σ = 6451545408. Its totient is φ = 605417472.

The previous prime is 2118971873. The next prime is 2118971917. The reversal of 2118971904 is 4091798112.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 87787 + ... + 109290.

Almost surely, 2^2118971904 is an apocalyptic number.

2118971904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2118971904 is an abundant number, since it is smaller than the sum of its proper divisors (4332573504).

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

2118971904 is an equidigital number, since it uses as much as digits as its factorization.

2118971904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197105 (or 197089 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 2118971904 is about 46032.2919698770. The cubic root of 2118971904 is about 1284.4239630235.

The spelling of 2118971904 in words is "two billion, one hundred eighteen million, nine hundred seventy-one thousand, nine hundred four".