721223 has 2 divisors, whose sum is σ = 721224. Its totient is φ = 721222.

The previous prime is 721219. The next prime is 721229. The reversal of 721223 is 322127.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 721223 - 2² = 721219 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360611 + 360612.

It is an arithmetic number, because the mean of its divisors is an integer number (360612).

2⁷²¹²²³ is an apocalyptic number.

721223 is a deficient number, since it is larger than the sum of its proper divisors (1).

721223 is an equidigital number, since it uses as much as digits as its factorization.

721223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 168, while the sum is 17.

The square root of 721223 is about 849.2484913145. The cubic root of 721223 is about 89.6788139840.

The spelling of 721223 in words is "seven hundred twenty-one thousand, two hundred twenty-three", and thus it is an iban number.