21507463703516 has 48 divisors (see below), whose sum is σ = 44547899424000. Its totient is φ = 9079910010864.

The previous prime is 21507463703387. The next prime is 21507463703519. The reversal of 21507463703516 is 61530736470512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21507463703519) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116893106 + ... + 117076953.

It is an arithmetic number, because the mean of its divisors is an integer number (928081238000).

Almost surely, 2^{21507463703516} is an apocalyptic number.

It is an amenable number.

21507463703516 is an abundant number, since it is smaller than the sum of its proper divisors (23040435720484).

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

21507463703516 is a wasteful number, since it uses less digits than its factorization.

21507463703516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233970151 (or 233970135 counting only the distinct ones).

The product of its (nonzero) digits is 3175200, while the sum is 50.

The spelling of 21507463703516 in words is "twenty-one trillion, five hundred seven billion, four hundred sixty-three million, seven hundred three thousand, five hundred sixteen".