221223203 has 2 divisors, whose sum is σ = 221223204. Its totient is φ = 221223202.

The previous prime is 221223187. The next prime is 221223209. The reversal of 221223203 is 302322122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221223203 - 2⁴ = 221223187 is a prime.

It is not a weakly prime, because it can be changed into another prime (221223209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110611601 + 110611602.

It is an arithmetic number, because the mean of its divisors is an integer number (110611602).

Almost surely, 2^221223203 is an apocalyptic number.

221223203 is a deficient number, since it is larger than the sum of its proper divisors (1).

221223203 is an equidigital number, since it uses as much as digits as its factorization.

221223203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 221223203 is about 14873.5739820663. The cubic root of 221223203 is about 604.7978315009.

Adding to 221223203 its reverse (302322122), we get a palindrome (523545325).

The spelling of 221223203 in words is "two hundred twenty-one million, two hundred twenty-three thousand, two hundred three".