2111955138 has 12 divisors (see below), whose sum is σ = 4575902838. Its totient is φ = 703985040.

The previous prime is 2111955103. The next prime is 2111955143. The reversal of 2111955138 is 8315591112.

2111955138 is a `hidden beast` number, since 21 + 119 + 5 + 513 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1679606289 + 432348849 = 40983^2 + 20793^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 58665403 + ... + 58665438.

Almost surely, 2^2111955138 is an apocalyptic number.

2111955138 is an abundant number, since it is smaller than the sum of its proper divisors (2463947700).

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

2111955138 is a wasteful number, since it uses less digits than its factorization.

2111955138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117330849 (or 117330846 counting only the distinct ones).

The product of its digits is 10800, while the sum is 36.

The square root of 2111955138 is about 45956.0130777247. The cubic root of 2111955138 is about 1283.0046475650.

The spelling of 2111955138 in words is "two billion, one hundred eleven million, nine hundred fifty-five thousand, one hundred thirty-eight".