22157957 has 2 divisors, whose sum is σ = 22157958. Its totient is φ = 22157956.

The previous prime is 22157923. The next prime is 22157959. The reversal of 22157957 is 75975122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12952801 + 9205156 = 3599^2 + 3034^2 .

It is a cyclic number.

It is not a de Polignac number, because 22157957 - 2²⁰ = 21109381 is a prime.

Together with 22157959, it forms a pair of twin primes.

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 22157957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22157959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11078978 + 11078979.

It is an arithmetic number, because the mean of its divisors is an integer number (11078979).

Almost surely, 2^22157957 is an apocalyptic number.

It is an amenable number.

22157957 is a deficient number, since it is larger than the sum of its proper divisors (1).

22157957 is an equidigital number, since it uses as much as digits as its factorization.

22157957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44100, while the sum is 38.

The square root of 22157957 is about 4707.2239164926. The cubic root of 22157957 is about 280.8729431539.

The spelling of 22157957 in words is "twenty-two million, one hundred fifty-seven thousand, nine hundred fifty-seven".