21891992759 has 32 divisors (see below), whose sum is σ = 27386612736. Its totient is φ = 17038771200.

The previous prime is 21891992719. The next prime is 21891992851. The reversal of 21891992759 is 95729919812.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21891992759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21891992719) 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 in 31 ways as a sum of consecutive naturals, for example, 1466684 + ... + 1481534.

It is an arithmetic number, because the mean of its divisors is an integer number (855831648).

Almost surely, 2^21891992759 is an apocalyptic number.

21891992759 is a deficient number, since it is larger than the sum of its proper divisors (5494619977).

21891992759 is a wasteful number, since it uses less digits than its factorization.

21891992759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15135.

The product of its digits is 7348320, while the sum is 62.

The spelling of 21891992759 in words is "twenty-one billion, eight hundred ninety-one million, nine hundred ninety-two thousand, seven hundred fifty-nine".