21794994593 has 2 divisors, whose sum is σ = 21794994594. Its totient is φ = 21794994592.

The previous prime is 21794994587. The next prime is 21794994647. The reversal of 21794994593 is 39549949712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11433383329 + 10361611264 = 106927^2 + 101792^2 .

It is a cyclic number.

It is not a de Polignac number, because 21794994593 - 2²² = 21790800289 is a prime.

It is not a weakly prime, because it can be changed into another prime (21794994523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10897497296 + 10897497297.

It is an arithmetic number, because the mean of its divisors is an integer number (10897497297).

Almost surely, 2^21794994593 is an apocalyptic number.

It is an amenable number.

21794994593 is a deficient number, since it is larger than the sum of its proper divisors (1).

21794994593 is an equidigital number, since it uses as much as digits as its factorization.

21794994593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22044960, while the sum is 62.

The spelling of 21794994593 in words is "twenty-one billion, seven hundred ninety-four million, nine hundred ninety-four thousand, five hundred ninety-three".