22002257 has 2 divisors, whose sum is σ = 22002258. Its totient is φ = 22002256.

The previous prime is 22002217. The next prime is 22002269. The reversal of 22002257 is 75220022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19571776 + 2430481 = 4424^2 + 1559^2 .

It is a cyclic number.

It is not a de Polignac number, because 22002257 - 2²⁴ = 5225041 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22002217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11001128 + 11001129.

It is an arithmetic number, because the mean of its divisors is an integer number (11001129).

Almost surely, 2^22002257 is an apocalyptic number.

It is an amenable number.

22002257 is a deficient number, since it is larger than the sum of its proper divisors (1).

22002257 is an equidigital number, since it uses as much as digits as its factorization.

22002257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560, while the sum is 20.

The square root of 22002257 is about 4690.6563506614. The cubic root of 22002257 is about 280.2135148633.

Adding to 22002257 its reverse (75220022), we get a palindrome (97222279).

The spelling of 22002257 in words is "twenty-two million, two thousand, two hundred fifty-seven".