22245521 has 2 divisors, whose sum is σ = 22245522. Its totient is φ = 22245520.

The previous prime is 22245497. The next prime is 22245533. The reversal of 22245521 is 12554222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14737921 + 7507600 = 3839^2 + 2740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22245521 is a prime.

It is a super-2 number, since 2×22245521² = 989726409122882, which contains 22 as substring.

It is equal to p_1403663 and since 22245521 and 1403663 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (22245121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11122760 + 11122761.

It is an arithmetic number, because the mean of its divisors is an integer number (11122761).

Almost surely, 2^22245521 is an apocalyptic number.

It is an amenable number.

22245521 is a deficient number, since it is larger than the sum of its proper divisors (1).

22245521 is an equidigital number, since it uses as much as digits as its factorization.

22245521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1600, while the sum is 23.

The square root of 22245521 is about 4716.5157690821. The cubic root of 22245521 is about 281.2424422002.

Adding to 22245521 its reverse (12554222), we get a palindrome (34799743).

The spelling of 22245521 in words is "twenty-two million, two hundred forty-five thousand, five hundred twenty-one".