22697221 has 2 divisors, whose sum is σ = 22697222. Its totient is φ = 22697220.

The previous prime is 22697189. The next prime is 22697237. The reversal of 22697221 is 12279622.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21669025 + 1028196 = 4655^2 + 1014^2 .

It is a cyclic number.

It is not a de Polignac number, because 22697221 - 2⁵ = 22697189 is a prime.

It is a super-2 number, since 2×22697221² = 1030327682245682, which contains 22 as substring.

It is a Chen prime.

It is a zygodrome in base 4.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22697291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11348610 + 11348611.

It is an arithmetic number, because the mean of its divisors is an integer number (11348611).

Almost surely, 2^22697221 is an apocalyptic number.

It is an amenable number.

22697221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22697221 is an equidigital number, since it uses as much as digits as its factorization.

22697221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 31.

The square root of 22697221 is about 4764.1600518874. The cubic root of 22697221 is about 283.1332639106.

The spelling of 22697221 in words is "twenty-two million, six hundred ninety-seven thousand, two hundred twenty-one".