21756047338053 has 20 divisors (see below), whose sum is σ = 37142599336480. Its totient is φ = 12432027049992.

The previous prime is 21756047338033. The next prime is 21756047338061. The reversal of 21756047338053 is 35083374065712.

21756047338053 is a `hidden beast` number, since 2 + 1 + 7 + 560 + 4 + 73 + 3 + 8 + 0 + 5 + 3 = 666.

It is not a de Polignac number, because 21756047338053 - 2¹² = 21756047333957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21756047338033) 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 19 ways as a sum of consecutive naturals, for example, 19185226363 + ... + 19185227496.

It is an arithmetic number, because the mean of its divisors is an integer number (1857129966824).

Almost surely, 2^{21756047338053} is an apocalyptic number.

It is an amenable number.

21756047338053 is a deficient number, since it is larger than the sum of its proper divisors (15386551998427).

21756047338053 is an equidigital number, since it uses as much as digits as its factorization.

21756047338053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38370453878 (or 38370453869 counting only the distinct ones).

The product of its (nonzero) digits is 12700800, while the sum is 54.

The spelling of 21756047338053 in words is "twenty-one trillion, seven hundred fifty-six billion, forty-seven million, three hundred thirty-eight thousand, fifty-three".