21053821184188 has 12 divisors (see below), whose sum is σ = 39678355308760. Its totient is φ = 9717148238832.

The previous prime is 21053821184177. The next prime is 21053821184239. The reversal of 21053821184188 is 88148112835012.

It is a Harshad number since it is a multiple of its sum of digits (52), and also a Moran number because the ratio is a prime number: 404881176619 = 21053821184188 / (2 + 1 + 0 + 5 + 3 + 8 + 2 + 1 + 1 + 8 + 4 + 1 + 8 + 8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202440588258 + ... + 202440588361.

Almost surely, 2^{21053821184188} is an apocalyptic number.

It is an amenable number.

21053821184188 is a deficient number, since it is larger than the sum of its proper divisors (18624534124572).

21053821184188 is a wasteful number, since it uses less digits than its factorization.

21053821184188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404881176636 (or 404881176634 counting only the distinct ones).

The product of its (nonzero) digits is 983040, while the sum is 52.

The spelling of 21053821184188 in words is "twenty-one trillion, fifty-three billion, eight hundred twenty-one million, one hundred eighty-four thousand, one hundred eighty-eight".