2121625836 has 36 divisors (see below), whose sum is σ = 5850545064. Its totient is φ = 642916800.

The previous prime is 2121625799. The next prime is 2121625873. The reversal of 2121625836 is 6385261212.

2121625836 is a `hidden beast` number, since 2 + 1 + 21 + 625 + 8 + 3 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (2121625799) and next prime (2121625873).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 2121625836.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2678425 + ... + 2679216.

Almost surely, 2^2121625836 is an apocalyptic number.

It is an amenable number.

2121625836 is an abundant number, since it is smaller than the sum of its proper divisors (3728919228).

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

2121625836 is a wasteful number, since it uses less digits than its factorization.

2121625836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5357662 (or 5357657 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 2121625836 is about 46061.1097999169. The cubic root of 2121625836 is about 1284.9599700874.

The spelling of 2121625836 in words is "two billion, one hundred twenty-one million, six hundred twenty-five thousand, eight hundred thirty-six".