21552360156 has 72 divisors (see below), whose sum is σ = 54777026304. Its totient is φ = 7145010720.

The previous prime is 21552360143. The next prime is 21552360173. The reversal of 21552360156 is 65106325512.

21552360156 is a `hidden beast` number, since 21 + 5 + 5 + 23 + 601 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21552360156.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5382051 + ... + 5386053.

It is an arithmetic number, because the mean of its divisors is an integer number (760792032).

Almost surely, 2^21552360156 is an apocalyptic number.

It is an amenable number.

21552360156 is an abundant number, since it is smaller than the sum of its proper divisors (33224666148).

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

21552360156 is a wasteful number, since it uses less digits than its factorization.

21552360156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4791 (or 4786 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

Adding to 21552360156 its reverse (65106325512), we get a palindrome (86658685668).

The spelling of 21552360156 in words is "twenty-one billion, five hundred fifty-two million, three hundred sixty thousand, one hundred fifty-six".