21736965615 has 8 divisors (see below), whose sum is σ = 34779145008. Its totient is φ = 11593048320.

The previous prime is 21736965553. The next prime is 21736965623. The reversal of 21736965615 is 51656963712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21736965615 - 2⁸ = 21736965359 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 724565506 + ... + 724565535.

It is an arithmetic number, because the mean of its divisors is an integer number (4347393126).

Almost surely, 2^21736965615 is an apocalyptic number.

21736965615 is a deficient number, since it is larger than the sum of its proper divisors (13042179393).

21736965615 is a wasteful number, since it uses less digits than its factorization.

21736965615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449131049.

The product of its digits is 2041200, while the sum is 51.

The spelling of 21736965615 in words is "twenty-one billion, seven hundred thirty-six million, nine hundred sixty-five thousand, six hundred fifteen".