21513540334525 has 12 divisors (see below), whose sum is σ = 26683095225184. Its totient is φ = 17206764390000.

The previous prime is 21513540334501. The next prime is 21513540334529. The reversal of 21513540334525 is 52543304531512.

It is not a de Polignac number, because 21513540334525 - 2³⁵ = 21479180596157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21513540334529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101589051 + ... + 101800600.

Almost surely, 2^{21513540334525} is an apocalyptic number.

21513540334525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21513540334525 is a deficient number, since it is larger than the sum of its proper divisors (5169554890659).

21513540334525 is a wasteful number, since it uses less digits than its factorization.

21513540334525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203393892 (or 203393887 counting only the distinct ones).

The product of its (nonzero) digits is 1080000, while the sum is 43.

The spelling of 21513540334525 in words is "twenty-one trillion, five hundred thirteen billion, five hundred forty million, three hundred thirty-four thousand, five hundred twenty-five".