22787321 has 2 divisors, whose sum is σ = 22787322. Its totient is φ = 22787320.

The previous prime is 22787311. The next prime is 22787333. The reversal of 22787321 is 12378722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16974400 + 5812921 = 4120^2 + 2411^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22787321 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 (22787311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11393660 + 11393661.

It is an arithmetic number, because the mean of its divisors is an integer number (11393661).

Almost surely, 2^22787321 is an apocalyptic number.

It is an amenable number.

22787321 is a deficient number, since it is larger than the sum of its proper divisors (1).

22787321 is an equidigital number, since it uses as much as digits as its factorization.

22787321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9408, while the sum is 32.

The square root of 22787321 is about 4773.6067077211. The cubic root of 22787321 is about 283.5074158192.

The spelling of 22787321 in words is "twenty-two million, seven hundred eighty-seven thousand, three hundred twenty-one".