2112785138 has 4 divisors (see below), whose sum is σ = 3169177710. Its totient is φ = 1056392568.

The previous prime is 2112785119. The next prime is 2112785159. The reversal of 2112785138 is 8315872112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1602160729 + 510624409 = 40027^2 + 22597^2 .

It is a super-2 number, since 2×2112785138² = 8927722078707358088, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 528196283 + ... + 528196286.

Almost surely, 2^2112785138 is an apocalyptic number.

2112785138 is a deficient number, since it is larger than the sum of its proper divisors (1056392572).

2112785138 is a wasteful number, since it uses less digits than its factorization.

2112785138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056392571.

The product of its digits is 26880, while the sum is 38.

The square root of 2112785138 is about 45965.0425649754. The cubic root of 2112785138 is about 1283.1726994911.

The spelling of 2112785138 in words is "two billion, one hundred twelve million, seven hundred eighty-five thousand, one hundred thirty-eight".