21053821184187 has 32 divisors (see below), whose sum is σ = 30711740135424. Its totient is φ = 12723255014400.

The previous prime is 21053821184177. The next prime is 21053821184239. The reversal of 21053821184187 is 78148112835012.

It is a de Polignac number, because none of the positive numbers 2^k-21053821184187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21053821184107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27646518 + ... + 28397844.

It is an arithmetic number, because the mean of its divisors is an integer number (959741879232).

Almost surely, 2^{21053821184187} is an apocalyptic number.

21053821184187 is a deficient number, since it is larger than the sum of its proper divisors (9657918951237).

21053821184187 is a wasteful number, since it uses less digits than its factorization.

21053821184187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753779.

The product of its (nonzero) digits is 860160, while the sum is 51.

The spelling of 21053821184187 in words is "twenty-one trillion, fifty-three billion, eight hundred twenty-one million, one hundred eighty-four thousand, one hundred eighty-seven".