21050522055 has 16 divisors (see below), whose sum is σ = 37423150560. Its totient is φ = 11226945024.

The previous prime is 21050522029. The next prime is 21050522063. The reversal of 21050522055 is 55022505012.

It is not a de Polignac number, because 21050522055 - 2⁵ = 21050522023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77964762 + ... + 77965031.

It is an arithmetic number, because the mean of its divisors is an integer number (2338946910).

Almost surely, 2^21050522055 is an apocalyptic number.

21050522055 is a deficient number, since it is larger than the sum of its proper divisors (16372628505).

21050522055 is a wasteful number, since it uses less digits than its factorization.

21050522055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155929807 (or 155929801 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The spelling of 21050522055 in words is "twenty-one billion, fifty million, five hundred twenty-two thousand, fifty-five".