21964822418 has 54 divisors (see below), whose sum is σ = 42158312469. Its totient is φ = 8551435200.

The previous prime is 21964822393. The next prime is 21964822423. The reversal of 21964822418 is 81422846912.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19231310329 + 2733512089 = 138677^2 + 52283^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=104797.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 16138058 + ... + 16139418.

Almost surely, 2^21964822418 is an apocalyptic number.

21964822418 is a deficient number, since it is larger than the sum of its proper divisors (20193490051).

21964822418 is an equidigital number, since it uses as much as digits as its factorization.

21964822418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2760 (or 1381 counting only the distinct ones).

The product of its digits is 442368, while the sum is 47.

The spelling of 21964822418 in words is "twenty-one billion, nine hundred sixty-four million, eight hundred twenty-two thousand, four hundred eighteen".