21964815149759 has 4 divisors (see below), whose sum is σ = 22919807112816. Its totient is φ = 21009823186704.

The previous prime is 21964815149737. The next prime is 21964815149807. The reversal of 21964815149759 is 95794151846912.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21964815149759 - 2⁴⁴ = 4372629105343 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21964815149692 and 21964815149701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21964815149359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 477495981494 + ... + 477495981539.

It is an arithmetic number, because the mean of its divisors is an integer number (5729951778204).

Almost surely, 2^{21964815149759} is an apocalyptic number.

21964815149759 is a deficient number, since it is larger than the sum of its proper divisors (954991963057).

21964815149759 is an equidigital number, since it uses as much as digits as its factorization.

21964815149759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954991963056.

The product of its digits is 195955200, while the sum is 71.

The spelling of 21964815149759 in words is "twenty-one trillion, nine hundred sixty-four billion, eight hundred fifteen million, one hundred forty-nine thousand, seven hundred fifty-nine".