22655921 has 2 divisors, whose sum is σ = 22655922. Its totient is φ = 22655920.

The previous prime is 22655909. The next prime is 22655981. The reversal of 22655921 is 12955622.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22193521 + 462400 = 4711^2 + 680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22655921 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (22655981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11327960 + 11327961.

It is an arithmetic number, because the mean of its divisors is an integer number (11327961).

Almost surely, 2^22655921 is an apocalyptic number.

It is an amenable number.

22655921 is a deficient number, since it is larger than the sum of its proper divisors (1).

22655921 is an equidigital number, since it uses as much as digits as its factorization.

22655921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 32.

The square root of 22655921 is about 4759.8236311863. The cubic root of 22655921 is about 282.9614293141.

The spelling of 22655921 in words is "twenty-two million, six hundred fifty-five thousand, nine hundred twenty-one".