22726721 has 2 divisors, whose sum is σ = 22726722. Its totient is φ = 22726720.

The previous prime is 22726667. The next prime is 22726729. The reversal of 22726721 is 12762722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22429696 + 297025 = 4736^2 + 545^2 .

It is a cyclic number.

It is not a de Polignac number, because 22726721 - 2⁶ = 22726657 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22726729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11363360 + 11363361.

It is an arithmetic number, because the mean of its divisors is an integer number (11363361).

Almost surely, 2^22726721 is an apocalyptic number.

It is an amenable number.

22726721 is a deficient number, since it is larger than the sum of its proper divisors (1).

22726721 is an equidigital number, since it uses as much as digits as its factorization.

22726721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4704, while the sum is 29.

The square root of 22726721 is about 4767.2550802322. The cubic root of 22726721 is about 283.2558753277.

The spelling of 22726721 in words is "twenty-two million, seven hundred twenty-six thousand, seven hundred twenty-one".