21113530564521 has 8 divisors (see below), whose sum is σ = 28153274595840. Its totient is φ = 14074736788112.

The previous prime is 21113530564519. The next prime is 21113530564531. The reversal of 21113530564521 is 12546503531112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21113530564521 - 2¹ = 21113530564519 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21113530564521.

It is not an unprimeable number, because it can be changed into a prime (21113530564531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237511881 + ... + 237600758.

It is an arithmetic number, because the mean of its divisors is an integer number (3519159324480).

Almost surely, 2^{21113530564521} is an apocalyptic number.

It is an amenable number.

21113530564521 is a deficient number, since it is larger than the sum of its proper divisors (7039744031319).

21113530564521 is a wasteful number, since it uses less digits than its factorization.

21113530564521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475127455.

The product of its (nonzero) digits is 108000, while the sum is 39.

The spelling of 21113530564521 in words is "twenty-one trillion, one hundred thirteen billion, five hundred thirty million, five hundred sixty-four thousand, five hundred twenty-one".