21515740435137 has 48 divisors (see below), whose sum is σ = 32670831247488. Its totient is φ = 12518647891200.

The previous prime is 21515740435127. The next prime is 21515740435157. The reversal of 21515740435137 is 73153404751512.

It is a happy number.

It is not a de Polignac number, because 21515740435137 - 2²⁴ = 21515723657921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21515740435127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5562637 + ... + 8600837.

It is an arithmetic number, because the mean of its divisors is an integer number (680642317656).

Almost surely, 2^{21515740435137} is an apocalyptic number.

It is an amenable number.

21515740435137 is a deficient number, since it is larger than the sum of its proper divisors (11155090812351).

21515740435137 is a wasteful number, since it uses less digits than its factorization.

21515740435137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3038758 (or 3038739 counting only the distinct ones).

The product of its (nonzero) digits is 1764000, while the sum is 48.

The spelling of 21515740435137 in words is "twenty-one trillion, five hundred fifteen billion, seven hundred forty million, four hundred thirty-five thousand, one hundred thirty-seven".