21722581579 has 2 divisors, whose sum is σ = 21722581580. Its totient is φ = 21722581578.

The previous prime is 21722581571. The next prime is 21722581607. The reversal of 21722581579 is 97518522712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21722581579 - 2³ = 21722581571 is a prime.

It is not a weakly prime, because it can be changed into another prime (21722581571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10861290789 + 10861290790.

It is an arithmetic number, because the mean of its divisors is an integer number (10861290790).

Almost surely, 2^21722581579 is an apocalyptic number.

21722581579 is a deficient number, since it is larger than the sum of its proper divisors (1).

21722581579 is an equidigital number, since it uses as much as digits as its factorization.

21722581579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 705600, while the sum is 49.

The spelling of 21722581579 in words is "twenty-one billion, seven hundred twenty-two million, five hundred eighty-one thousand, five hundred seventy-nine".