21512454342504 has 64 divisors (see below), whose sum is σ = 56432962828800. Its totient is φ = 6820724703936.

The previous prime is 21512454342503. The next prime is 21512454342517. The reversal of 21512454342504 is 40524345421512.

It is not an unprimeable number, because it can be changed into a prime (21512454342503) 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, 108761074 + ... + 108958689.

It is an arithmetic number, because the mean of its divisors is an integer number (881765044200).

Almost surely, 2^{21512454342504} is an apocalyptic number.

21512454342504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21512454342504 is an abundant number, since it is smaller than the sum of its proper divisors (34920508486296).

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

21512454342504 is a wasteful number, since it uses less digits than its factorization.

21512454342504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217719974 (or 217719970 counting only the distinct ones).

The product of its (nonzero) digits is 768000, while the sum is 42.

The spelling of 21512454342504 in words is "twenty-one trillion, five hundred twelve billion, four hundred fifty-four million, three hundred forty-two thousand, five hundred four".