21515403512 has 16 divisors (see below), whose sum is σ = 40343038200. Its totient is φ = 10757260000.

The previous prime is 21515403491. The next prime is 21515403527. The reversal of 21515403512 is 21530451512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252914 + ... + 327102.

Almost surely, 2^21515403512 is an apocalyptic number.

It is an amenable number.

21515403512 is a deficient number, since it is larger than the sum of its proper divisors (18827634688).

21515403512 is a wasteful number, since it uses less digits than its factorization.

21515403512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110446 (or 110442 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 29.

The spelling of 21515403512 in words is "twenty-one billion, five hundred fifteen million, four hundred three thousand, five hundred twelve".