21964336997 has 2 divisors, whose sum is σ = 21964336998. Its totient is φ = 21964336996.

The previous prime is 21964336981. The next prime is 21964337023. The reversal of 21964336997 is 79963346912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15214235716 + 6750101281 = 123346^2 + 82159^2 .

It is a cyclic number.

It is not a de Polignac number, because 21964336997 - 2⁴ = 21964336981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21964936997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10982168498 + 10982168499.

It is an arithmetic number, because the mean of its divisors is an integer number (10982168499).

Almost surely, 2^21964336997 is an apocalyptic number.

It is an amenable number.

21964336997 is a deficient number, since it is larger than the sum of its proper divisors (1).

21964336997 is an equidigital number, since it uses as much as digits as its factorization.

21964336997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13226976, while the sum is 59.

The spelling of 21964336997 in words is "twenty-one billion, nine hundred sixty-four million, three hundred thirty-six thousand, nine hundred ninety-seven".