21056116101 has 16 divisors (see below), whose sum is σ = 29167594560. Its totient is φ = 13495180160.

The previous prime is 21056116099. The next prime is 21056116129. The reversal of 21056116101 is 10161165012.

It is not a de Polignac number, because 21056116101 - 2¹ = 21056116099 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21056116801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 499095 + ... + 539636.

It is an arithmetic number, because the mean of its divisors is an integer number (1822974660).

Almost surely, 2^21056116101 is an apocalyptic number.

It is an amenable number.

21056116101 is a deficient number, since it is larger than the sum of its proper divisors (8111478459).

21056116101 is a wasteful number, since it uses less digits than its factorization.

21056116101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038996.

The product of its (nonzero) digits is 360, while the sum is 24.

The spelling of 21056116101 in words is "twenty-one billion, fifty-six million, one hundred sixteen thousand, one hundred one".