2112136891 has 4 divisors (see below), whose sum is σ = 2113174800. Its totient is φ = 2111098984.

The previous prime is 2112136889. The next prime is 2112136913. The reversal of 2112136891 is 1986312112.

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

It is a cyclic number.

It is not a de Polignac number, because 2112136891 - 2¹ = 2112136889 is a prime.

It is a super-2 number, since 2×2112136891² = 8922244492646291762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2112136991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 515896 + ... + 519973.

It is an arithmetic number, because the mean of its divisors is an integer number (528293700).

Almost surely, 2^2112136891 is an apocalyptic number.

2112136891 is a deficient number, since it is larger than the sum of its proper divisors (1037909).

2112136891 is a wasteful number, since it uses less digits than its factorization.

2112136891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037908.

The product of its digits is 5184, while the sum is 34.

The square root of 2112136891 is about 45957.9905021967. The cubic root of 2112136891 is about 1283.0414512594.

The spelling of 2112136891 in words is "two billion, one hundred twelve million, one hundred thirty-six thousand, eight hundred ninety-one".