2161852814920 has 32 divisors (see below), whose sum is σ = 4907214585720. Its totient is φ = 857088547840.

The previous prime is 2161852814899. The next prime is 2161852814969. The reversal of 2161852814920 is 294182581612.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1093685090436 + 1068167724484 = 1045794^2 + 1033522^2 .

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, 239138491 + ... + 239147530.

Almost surely, 2^{2161852814920} is an apocalyptic number.

2161852814920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2161852814920 is an abundant number, since it is smaller than the sum of its proper divisors (2745361770800).

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

2161852814920 is a wasteful number, since it uses less digits than its factorization.

2161852814920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478286145 (or 478286141 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 49.

The spelling of 2161852814920 in words is "two trillion, one hundred sixty-one billion, eight hundred fifty-two million, eight hundred fourteen thousand, nine hundred twenty".