21055522110 has 64 divisors (see below), whose sum is σ = 57779661312. Its totient is φ = 4810409856.

The previous prime is 21055522097. The next prime is 21055522139. The reversal of 21055522110 is 1122555012.

It is a super-2 number, since 2×21055522110² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 442077 + ... + 487383.

It is an arithmetic number, because the mean of its divisors is an integer number (902807208).

Almost surely, 2^21055522110 is an apocalyptic number.

21055522110 is an abundant number, since it is smaller than the sum of its proper divisors (36724139202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21055522110 is a wasteful number, since it uses less digits than its factorization.

21055522110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47537.

The product of its (nonzero) digits is 1000, while the sum is 24.

The spelling of 21055522110 in words is "twenty-one billion, fifty-five million, five hundred twenty-two thousand, one hundred ten".