21522456252855 has 20 divisors (see below), whose sum is σ = 38580995653992. Its totient is φ = 11478643334640.

The previous prime is 21522456252823. The next prime is 21522456252959. The reversal of 21522456252855 is 55825265422512.

It is a happy number.

21522456252855 is a `hidden beast` number, since 2 + 1 + 5 + 2 + 2 + 4 + 5 + 62 + 528 + 55 = 666.

It is not a de Polignac number, because 21522456252855 - 2⁵ = 21522456252823 is a prime.

It is a super-2 number, since 2×21522456252855² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 26570933241 + ... + 26570934050.

Almost surely, 2^{21522456252855} is an apocalyptic number.

21522456252855 is a deficient number, since it is larger than the sum of its proper divisors (17058539401137).

21522456252855 is an equidigital number, since it uses as much as digits as its factorization.

21522456252855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53141867308 (or 53141867299 counting only the distinct ones).

The product of its digits is 19200000, while the sum is 54.

The spelling of 21522456252855 in words is "twenty-one trillion, five hundred twenty-two billion, four hundred fifty-six million, two hundred fifty-two thousand, eight hundred fifty-five".