22436521 has 2 divisors, whose sum is σ = 22436522. Its totient is φ = 22436520.

The previous prime is 22436507. The next prime is 22436539. The reversal of 22436521 is 12563422.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12425625 + 10010896 = 3525^2 + 3164^2 .

It is a cyclic number.

It is not a de Polignac number, because 22436521 - 2⁹ = 22436009 is a prime.

It is not a weakly prime, because it can be changed into another prime (22436551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11218260 + 11218261.

It is an arithmetic number, because the mean of its divisors is an integer number (11218261).

Almost surely, 2^22436521 is an apocalyptic number.

It is an amenable number.

22436521 is a deficient number, since it is larger than the sum of its proper divisors (1).

22436521 is an equidigital number, since it uses as much as digits as its factorization.

22436521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 25.

The square root of 22436521 is about 4736.7204899593. The cubic root of 22436521 is about 282.0450651451.

Adding to 22436521 its reverse (12563422), we get a palindrome (34999943).

The spelling of 22436521 in words is "twenty-two million, four hundred thirty-six thousand, five hundred twenty-one".