22257 has 6 divisors (see below), whose sum is σ = 32162. Its totient is φ = 14832.

The previous prime is 22247. The next prime is 22259. The reversal of 22257 is 75222.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20736 + 1521 = 144^2 + 39^2 .

It is not a de Polignac number, because 22257 - 2⁶ = 22193 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (22259) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1228 + ... + 1245.

2²²²⁵⁷ is an apocalyptic number.

It is an amenable number.

22257 is a deficient number, since it is larger than the sum of its proper divisors (9905).

22257 is a wasteful number, since it uses less digits than its factorization.

22257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2479 (or 2476 counting only the distinct ones).

The product of its digits is 280, while the sum is 18.

The square root of 22257 is about 149.1878011099. The cubic root of 22257 is about 28.1290808893.

Adding to 22257 its reverse (75222), we get a palindrome (97479).

The spelling of 22257 in words is "twenty-two thousand, two hundred fifty-seven".