2157135812 has 24 divisors (see below), whose sum is σ = 4066722072. Its totient is φ = 995270400.

The previous prime is 2157135787. The next prime is 2157135817. The reversal of 2157135812 is 2185317512.

It can be written as a sum of positive squares in 4 ways, for example, as 2876416 + 2154259396 = 1696^2 + 46414^2 .

It is a super-2 number, since 2×2157135812² = 9306469822825798688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2157135817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 226262 + ... + 235602.

It is an arithmetic number, because the mean of its divisors is an integer number (169446753).

Almost surely, 2^2157135812 is an apocalyptic number.

It is an amenable number.

2157135812 is a deficient number, since it is larger than the sum of its proper divisors (1909586260).

2157135812 is a wasteful number, since it uses less digits than its factorization.

2157135812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13799 (or 13797 counting only the distinct ones).

The product of its digits is 16800, while the sum is 35.

The square root of 2157135812 is about 46444.9761761162. The cubic root of 2157135812 is about 1292.0891996232.

The spelling of 2157135812 in words is "two billion, one hundred fifty-seven million, one hundred thirty-five thousand, eight hundred twelve".