22764446721 has 12 divisors (see below), whose sum is σ = 33942688000. Its totient is φ = 14686739640.

The previous prime is 22764446701. The next prime is 22764446741. The reversal of 22764446721 is 12764446722.

It is an interprime number because it is at equal distance from previous prime (22764446701) and next prime (22764446741).

It is not a de Polignac number, because 22764446721 - 2⁶ = 22764446657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22764446701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40796221 + ... + 40796778.

Almost surely, 2^22764446721 is an apocalyptic number.

It is an amenable number.

22764446721 is a deficient number, since it is larger than the sum of its proper divisors (11178241279).

22764446721 is a wasteful number, since it uses less digits than its factorization.

22764446721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81593036 (or 81593033 counting only the distinct ones).

The product of its digits is 903168, while the sum is 45.

Subtracting from 22764446721 its reverse (12764446722), we obtain a palindrome (9999999999).

The spelling of 22764446721 in words is "twenty-two billion, seven hundred sixty-four million, four hundred forty-six thousand, seven hundred twenty-one".