22216657 has 2 divisors, whose sum is σ = 22216658. Its totient is φ = 22216656.

The previous prime is 22216619. The next prime is 22216661. The reversal of 22216657 is 75661222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21752896 + 463761 = 4664^2 + 681^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22216657 is a prime.

It is not a weakly prime, because it can be changed into another prime (22216157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11108328 + 11108329.

It is an arithmetic number, because the mean of its divisors is an integer number (11108329).

Almost surely, 2^22216657 is an apocalyptic number.

It is an amenable number.

22216657 is a deficient number, since it is larger than the sum of its proper divisors (1).

22216657 is an equidigital number, since it uses as much as digits as its factorization.

22216657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 31.

The square root of 22216657 is about 4713.4548899931. The cubic root of 22216657 is about 281.1207503567.

Adding to 22216657 its reverse (75661222), we get a palindrome (97877879).

The spelling of 22216657 in words is "twenty-two million, two hundred sixteen thousand, six hundred fifty-seven".