21513530225512 has 64 divisors (see below), whose sum is σ = 43670349072000. Its totient is φ = 9876874993920.

The previous prime is 21513530225497. The next prime is 21513530225513. The reversal of 21513530225512 is 21552203531512.

It is not an unprimeable number, because it can be changed into a prime (21513530225513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81223758 + ... + 81488194.

It is an arithmetic number, because the mean of its divisors is an integer number (682349204250).

Almost surely, 2^{21513530225512} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21513530225512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21835174536000).

21513530225512 is an abundant number, since it is smaller than the sum of its proper divisors (22156818846488).

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

21513530225512 is a wasteful number, since it uses less digits than its factorization.

21513530225512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268586 (or 268582 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 37.

The spelling of 21513530225512 in words is "twenty-one trillion, five hundred thirteen billion, five hundred thirty million, two hundred twenty-five thousand, five hundred twelve".