21525806055 has 16 divisors (see below), whose sum is σ = 37090620000. Its totient is φ = 10597319808.

The previous prime is 21525806041. The next prime is 21525806117. The reversal of 21525806055 is 55060852512.

It is not a de Polignac number, because 21525806055 - 2⁴ = 21525806039 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 55194180 + ... + 55194569.

It is an arithmetic number, because the mean of its divisors is an integer number (2318163750).

Almost surely, 2^21525806055 is an apocalyptic number.

21525806055 is a deficient number, since it is larger than the sum of its proper divisors (15564813945).

21525806055 is a wasteful number, since it uses less digits than its factorization.

21525806055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110388770.

The product of its (nonzero) digits is 120000, while the sum is 39.

The spelling of 21525806055 in words is "twenty-one billion, five hundred twenty-five million, eight hundred six thousand, fifty-five".