223236721 has 2 divisors, whose sum is σ = 223236722. Its totient is φ = 223236720.

The previous prime is 223236703. The next prime is 223236743. The reversal of 223236721 is 127632322.

223236721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209091600 + 14145121 = 14460^2 + 3761^2 .

It is a cyclic number.

It is not a de Polignac number, because 223236721 - 2⁷ = 223236593 is a prime.

It is a super-3 number, since 3×223236721³ (a number of 26 digits) contains 333 as substring.

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 223236721.

It is not a weakly prime, because it can be changed into another prime (223236791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111618360 + 111618361.

It is an arithmetic number, because the mean of its divisors is an integer number (111618361).

Almost surely, 2^223236721 is an apocalyptic number.

It is an amenable number.

223236721 is a deficient number, since it is larger than the sum of its proper divisors (1).

223236721 is an equidigital number, since it uses as much as digits as its factorization.

223236721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 28.

The square root of 223236721 is about 14941.1084260841. The cubic root of 223236721 is about 606.6271984883.

The spelling of 223236721 in words is "two hundred twenty-three million, two hundred thirty-six thousand, seven hundred twenty-one".