21513540334530 has 64 divisors (see below), whose sum is σ = 52311509434368. Its totient is φ = 5661971259840.

The previous prime is 21513540334529. The next prime is 21513540334549. The reversal of 21513540334530 is 3543304531512.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14053962 + ... + 15509381.

It is an arithmetic number, because the mean of its divisors is an integer number (817367334912).

Almost surely, 2^{21513540334530} is an apocalyptic number.

21513540334530 is an abundant number, since it is smaller than the sum of its proper divisors (30797969099838).

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

21513540334530 is a wasteful number, since it uses less digits than its factorization.

21513540334530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29563671.

The product of its (nonzero) digits is 324000, while the sum is 39.

The spelling of 21513540334530 in words is "twenty-one trillion, five hundred thirteen billion, five hundred forty million, three hundred thirty-four thousand, five hundred thirty".