22521281 has 2 divisors, whose sum is σ = 22521282. Its totient is φ = 22521280.

The previous prime is 22521263. The next prime is 22521299. The reversal of 22521281 is 18212522.

It is a balanced prime because it is at equal distance from previous prime (22521263) and next prime (22521299).

It can be written as a sum of positive squares in only one way, i.e., 11498881 + 11022400 = 3391^2 + 3320^2 .

It is a cyclic number.

It is not a de Polignac number, because 22521281 - 2⁶ = 22521217 is a prime.

It is a super-2 number, since 2×22521281² = 1014416195761922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22521211) 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, 11260640 + 11260641.

It is an arithmetic number, because the mean of its divisors is an integer number (11260641).

Almost surely, 2^22521281 is an apocalyptic number.

It is an amenable number.

22521281 is a deficient number, since it is larger than the sum of its proper divisors (1).

22521281 is an equidigital number, since it uses as much as digits as its factorization.

22521281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 640, while the sum is 23.

The square root of 22521281 is about 4745.6591744456. The cubic root of 22521281 is about 282.3997858968.

The spelling of 22521281 in words is "twenty-two million, five hundred twenty-one thousand, two hundred eighty-one".