21515919032 has 16 divisors (see below), whose sum is σ = 42715427760. Its totient is φ = 10125138304.

The previous prime is 21515918999. The next prime is 21515919053. The reversal of 21515919032 is 23091951512.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 79102508 + ... + 79102779.

It is an arithmetic number, because the mean of its divisors is an integer number (2669714235).

Almost surely, 2^21515919032 is an apocalyptic number.

It is an amenable number.

21515919032 is a deficient number, since it is larger than the sum of its proper divisors (21199508728).

21515919032 is a wasteful number, since it uses less digits than its factorization.

21515919032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158205310 (or 158205306 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 38.

The spelling of 21515919032 in words is "twenty-one billion, five hundred fifteen million, nine hundred nineteen thousand, thirty-two".