21964612745 has 16 divisors (see below), whose sum is σ = 27212731392. Its totient is φ = 17001766080.

The previous prime is 21964612723. The next prime is 21964612751. The reversal of 21964612745 is 54721646912.

It is not a de Polignac number, because 21964612745 - 2⁸ = 21964612489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21964612745.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1220684 + ... + 1238546.

It is an arithmetic number, because the mean of its divisors is an integer number (1700795712).

Almost surely, 2^21964612745 is an apocalyptic number.

It is an amenable number.

21964612745 is a deficient number, since it is larger than the sum of its proper divisors (5248118647).

21964612745 is a wasteful number, since it uses less digits than its factorization.

21964612745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25832.

The product of its digits is 725760, while the sum is 47.

The spelling of 21964612745 in words is "twenty-one billion, nine hundred sixty-four million, six hundred twelve thousand, seven hundred forty-five".