21088805101 has 24 divisors (see below), whose sum is σ = 26112513024. Its totient is φ = 16676412480.

The previous prime is 21088805081. The next prime is 21088805119. The reversal of 21088805101 is 10150888012.

It is a de Polignac number, because none of the positive numbers 2^k-21088805101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21088805161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2812980 + ... + 2820466.

It is an arithmetic number, because the mean of its divisors is an integer number (1088021376).

Almost surely, 2^21088805101 is an apocalyptic number.

It is an amenable number.

21088805101 is a deficient number, since it is larger than the sum of its proper divisors (5023707923).

21088805101 is a wasteful number, since it uses less digits than its factorization.

21088805101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9901 (or 9888 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 34.

The spelling of 21088805101 in words is "twenty-one billion, eighty-eight million, eight hundred five thousand, one hundred one".