21722581601 has 16 divisors (see below), whose sum is σ = 24910828800. Its totient is φ = 18555687360.

The previous prime is 21722581579. The next prime is 21722581607. The reversal of 21722581601 is 10618522712.

It is not a de Polignac number, because 21722581601 - 2²² = 21718387297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21722581607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3288500 + ... + 3295098.

It is an arithmetic number, because the mean of its divisors is an integer number (1556926800).

Almost surely, 2^21722581601 is an apocalyptic number.

It is an amenable number.

21722581601 is a deficient number, since it is larger than the sum of its proper divisors (3188247199).

21722581601 is a wasteful number, since it uses less digits than its factorization.

21722581601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8144.

The product of its (nonzero) digits is 13440, while the sum is 35.

The spelling of 21722581601 in words is "twenty-one billion, seven hundred twenty-two million, five hundred eighty-one thousand, six hundred one".