21692518905 has 8 divisors (see below), whose sum is σ = 34708030272. Its totient is φ = 11569343408.

The previous prime is 21692518901. The next prime is 21692518909. The reversal of 21692518905 is 50981529612.

It is an interprime number because it is at equal distance from previous prime (21692518901) and next prime (21692518909).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21692518905 - 2² = 21692518901 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21692518901) 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 7 ways as a sum of consecutive naturals, for example, 723083949 + ... + 723083978.

It is an arithmetic number, because the mean of its divisors is an integer number (4338503784).

Almost surely, 2^21692518905 is an apocalyptic number.

It is an amenable number.

21692518905 is a deficient number, since it is larger than the sum of its proper divisors (13015511367).

21692518905 is a wasteful number, since it uses less digits than its factorization.

21692518905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1446167935.

The product of its (nonzero) digits is 388800, while the sum is 48.

The spelling of 21692518905 in words is "twenty-one billion, six hundred ninety-two million, five hundred eighteen thousand, nine hundred five".