22757221 has 2 divisors, whose sum is σ = 22757222. Its totient is φ = 22757220.

The previous prime is 22757213. The next prime is 22757227. The reversal of 22757221 is 12275722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16924996 + 5832225 = 4114^2 + 2415^2 .

It is a cyclic number.

It is not a de Polignac number, because 22757221 - 2³ = 22757213 is a prime.

It is a super-2 number, since 2×22757221² = 1035782215285682, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22757221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22757227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11378610 + 11378611.

It is an arithmetic number, because the mean of its divisors is an integer number (11378611).

Almost surely, 2^22757221 is an apocalyptic number.

It is an amenable number.

22757221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22757221 is an equidigital number, since it uses as much as digits as its factorization.

22757221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3920, while the sum is 28.

The square root of 22757221 is about 4770.4529135083. The cubic root of 22757221 is about 283.3825315566.

The spelling of 22757221 in words is "twenty-two million, seven hundred fifty-seven thousand, two hundred twenty-one".