22211582581 has 2 divisors, whose sum is σ = 22211582582. Its totient is φ = 22211582580.

The previous prime is 22211582461. The next prime is 22211582587. The reversal of 22211582581 is 18528511222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20287444356 + 1924138225 = 142434^2 + 43865^2 .

It is a cyclic number.

It is not a de Polignac number, because 22211582581 - 2¹¹ = 22211580533 is a prime.

It is a super-2 number, since 2×22211582581² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22211582581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22211582587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11105791290 + 11105791291.

It is an arithmetic number, because the mean of its divisors is an integer number (11105791291).

Almost surely, 2^22211582581 is an apocalyptic number.

It is an amenable number.

22211582581 is a deficient number, since it is larger than the sum of its proper divisors (1).

22211582581 is an equidigital number, since it uses as much as digits as its factorization.

22211582581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25600, while the sum is 37.

The spelling of 22211582581 in words is "twenty-two billion, two hundred eleven million, five hundred eighty-two thousand, five hundred eighty-one".