21692774597 has 6 divisors (see below), whose sum is σ = 23489809362. Its totient is φ = 20024099472.

The previous prime is 21692774581. The next prime is 21692774671. The reversal of 21692774597 is 79547729612.

It can be written as a sum of positive squares in 3 ways, for example, as 129026881 + 21563747716 = 11359^2 + 146846^2 .

It is not a de Polignac number, because 21692774597 - 2⁴ = 21692774581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21692744597) 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 5 ways as a sum of consecutive naturals, for example, 64179638 + ... + 64179975.

It is an arithmetic number, because the mean of its divisors is an integer number (3914968227).

Almost surely, 2^21692774597 is an apocalyptic number.

It is an amenable number.

21692774597 is a deficient number, since it is larger than the sum of its proper divisors (1797034765).

21692774597 is a wasteful number, since it uses less digits than its factorization.

21692774597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128359639 (or 128359626 counting only the distinct ones).

The product of its digits is 13335840, while the sum is 59.

The spelling of 21692774597 in words is "twenty-one billion, six hundred ninety-two million, seven hundred seventy-four thousand, five hundred ninety-seven".