21541500516 has 24 divisors (see below), whose sum is σ = 50376975264. Its totient is φ = 7164289600.

The previous prime is 21541500481. The next prime is 21541500523. The reversal of 21541500516 is 61500514512.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2020785 + ... + 2031416.

It is an arithmetic number, because the mean of its divisors is an integer number (2099040636).

Almost surely, 2^21541500516 is an apocalyptic number.

It is an amenable number.

21541500516 is an abundant number, since it is smaller than the sum of its proper divisors (28835474748).

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

21541500516 is a wasteful number, since it uses less digits than its factorization.

21541500516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4052651 (or 4052649 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 30.

The spelling of 21541500516 in words is "twenty-one billion, five hundred forty-one million, five hundred thousand, five hundred sixteen".