21530401235504 has 80 divisors (see below), whose sum is σ = 48773773278720. Its totient is φ = 9016844712960.

The previous prime is 21530401235477. The next prime is 21530401235509. The reversal of 21530401235504 is 40553210403512.

It is not an unprimeable number, because it can be changed into a prime (21530401235509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11081714 + ... + 12878865.

It is an arithmetic number, because the mean of its divisors is an integer number (609672165984).

Almost surely, 2^{21530401235504} is an apocalyptic number.

It is an amenable number.

21530401235504 is an abundant number, since it is smaller than the sum of its proper divisors (27243372043216).

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

21530401235504 is a wasteful number, since it uses less digits than its factorization.

21530401235504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23960778 (or 23960772 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 35.

The spelling of 21530401235504 in words is "twenty-one trillion, five hundred thirty billion, four hundred one million, two hundred thirty-five thousand, five hundred four".