21736965616 has 40 divisors (see below), whose sum is σ = 42667269120. Its totient is φ = 10726332096.

The previous prime is 21736965553. The next prime is 21736965623. The reversal of 21736965616 is 61656963712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1345201 + ... + 1361263.

It is an arithmetic number, because the mean of its divisors is an integer number (1066681728).

Almost surely, 2^21736965616 is an apocalyptic number.

It is an amenable number.

21736965616 is a deficient number, since it is larger than the sum of its proper divisors (20930303504).

21736965616 is a wasteful number, since it uses less digits than its factorization.

21736965616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17173 (or 17167 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 52.

The spelling of 21736965616 in words is "twenty-one billion, seven hundred thirty-six million, nine hundred sixty-five thousand, six hundred sixteen".