21152516300055 has 96 divisors (see below), whose sum is σ = 43730632632960. Its totient is φ = 9253660631040.

The previous prime is 21152516300033. The next prime is 21152516300059. The reversal of 21152516300055 is 55000361525112.

21152516300055 is a `hidden beast` number, since 2 + 1 + 15 + 2 + 5 + 1 + 630 + 0 + 0 + 5 + 5 = 666.

It is not a de Polignac number, because 21152516300055 - 2⁸ = 21152516299799 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21152516299992 and 21152516300019.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152516300059) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9213526 + ... + 11278035.

It is an arithmetic number, because the mean of its divisors is an integer number (455527423260).

Almost surely, 2^{21152516300055} is an apocalyptic number.

21152516300055 is an abundant number, since it is smaller than the sum of its proper divisors (22578116332905).

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

21152516300055 is a wasteful number, since it uses less digits than its factorization.

21152516300055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20491721 (or 20491718 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

Adding to 21152516300055 its reverse (55000361525112), we get a palindrome (76152877825167).

The spelling of 21152516300055 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred sixteen million, three hundred thousand, fifty-five".