221320223 has 2 divisors, whose sum is σ = 221320224. Its totient is φ = 221320222.

The previous prime is 221320219. The next prime is 221320243. The reversal of 221320223 is 322023122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221320223 - 2² = 221320219 is a prime.

It is a super-2 number, since 2×221320223² = 97965282217539458, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221320213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110660111 + 110660112.

It is an arithmetic number, because the mean of its divisors is an integer number (110660112).

Almost surely, 2^221320223 is an apocalyptic number.

221320223 is a deficient number, since it is larger than the sum of its proper divisors (1).

221320223 is an equidigital number, since it uses as much as digits as its factorization.

221320223 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 221320223 is about 14876.8351136927. The cubic root of 221320223 is about 604.8862322790.

Adding to 221320223 its reverse (322023122), we get a palindrome (543343345).

The spelling of 221320223 in words is "two hundred twenty-one million, three hundred twenty thousand, two hundred twenty-three".