21531512500144 has 80 divisors (see below), whose sum is σ = 44237080395648. Its totient is φ = 10117390509056.

The previous prime is 21531512500103. The next prime is 21531512500279. The reversal of 21531512500144 is 44100521513512.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 507282987 + ... + 507325429.

Almost surely, 2^{21531512500144} is an apocalyptic number.

It is an amenable number.

21531512500144 is an abundant number, since it is smaller than the sum of its proper divisors (22705567895504).

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

21531512500144 is a wasteful number, since it uses less digits than its factorization.

21531512500144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45202 (or 45196 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 34.

The spelling of 21531512500144 in words is "twenty-one trillion, five hundred thirty-one billion, five hundred twelve million, five hundred thousand, one hundred forty-four".