22152281 has 2 divisors, whose sum is σ = 22152282. Its totient is φ = 22152280.

The previous prime is 22152239. The next prime is 22152283. The reversal of 22152281 is 18225122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13690000 + 8462281 = 3700^2 + 2909^2 .

It is a cyclic number.

It is not a de Polignac number, because 22152281 - 2¹⁰ = 22151257 is a prime.

It is a super-2 number, since 2×22152281² = 981447107005922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 22152283, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (22152283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11076140 + 11076141.

It is an arithmetic number, because the mean of its divisors is an integer number (11076141).

Almost surely, 2^22152281 is an apocalyptic number.

It is an amenable number.

22152281 is a deficient number, since it is larger than the sum of its proper divisors (1).

22152281 is an equidigital number, since it uses as much as digits as its factorization.

22152281 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 22152281 is about 4706.6209747546. The cubic root of 22152281 is about 280.8489582265.

The spelling of 22152281 in words is "twenty-two million, one hundred fifty-two thousand, two hundred eighty-one".