22505521 has 2 divisors, whose sum is σ = 22505522. Its totient is φ = 22505520.

The previous prime is 22505513. The next prime is 22505551. The reversal of 22505521 is 12550522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11316496 + 11189025 = 3364^2 + 3345^2 .

It is a cyclic number.

It is not a de Polignac number, because 22505521 - 2³ = 22505513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22505492 and 22505501.

It is not a weakly prime, because it can be changed into another prime (22505551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11252760 + 11252761.

It is an arithmetic number, because the mean of its divisors is an integer number (11252761).

Almost surely, 2^22505521 is an apocalyptic number.

It is an amenable number.

22505521 is a deficient number, since it is larger than the sum of its proper divisors (1).

22505521 is an equidigital number, since it uses as much as digits as its factorization.

22505521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 22505521 is about 4743.9984190554. The cubic root of 22505521 is about 282.3338977089. Note that the first 3 decimals are identical.

The spelling of 22505521 in words is "twenty-two million, five hundred five thousand, five hundred twenty-one".