22702721 has 2 divisors, whose sum is σ = 22702722. Its totient is φ = 22702720.

The previous prime is 22702711. The next prime is 22702723. The reversal of 22702721 is 12720722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19228225 + 3474496 = 4385^2 + 1864^2 .

It is a cyclic number.

It is not a de Polignac number, because 22702721 - 2⁶ = 22702657 is a prime.

Together with 22702723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22702723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11351360 + 11351361.

It is an arithmetic number, because the mean of its divisors is an integer number (11351361).

Almost surely, 2^22702721 is an apocalyptic number.

It is an amenable number.

22702721 is a deficient number, since it is larger than the sum of its proper divisors (1).

22702721 is an equidigital number, since it uses as much as digits as its factorization.

22702721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 22702721 is about 4764.7372435424. The cubic root of 22702721 is about 283.1561317202.

The spelling of 22702721 in words is "twenty-two million, seven hundred two thousand, seven hundred twenty-one".