22212257 has 2 divisors, whose sum is σ = 22212258. Its totient is φ = 22212256.

The previous prime is 22212233. The next prime is 22212271. The reversal of 22212257 is 75221222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20511841 + 1700416 = 4529^2 + 1304^2 .

It is a cyclic number.

It is not a de Polignac number, because 22212257 - 2²² = 18017953 is a prime.

It is a super-2 number, since 2×22212257² = 986768722068098, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22212277) 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, 11106128 + 11106129.

It is an arithmetic number, because the mean of its divisors is an integer number (11106129).

Almost surely, 2^22212257 is an apocalyptic number.

It is an amenable number.

22212257 is a deficient number, since it is larger than the sum of its proper divisors (1).

22212257 is an equidigital number, since it uses as much as digits as its factorization.

22212257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1120, while the sum is 23.

The square root of 22212257 is about 4712.9881179566. The cubic root of 22212257 is about 281.1021905142.

Adding to 22212257 its reverse (75221222), we get a palindrome (97433479).

The spelling of 22212257 in words is "twenty-two million, two hundred twelve thousand, two hundred fifty-seven".