223671221 has 2 divisors, whose sum is σ = 223671222. Its totient is φ = 223671220.

The previous prime is 223671209. The next prime is 223671263. The reversal of 223671221 is 122176322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199798225 + 23872996 = 14135^2 + 4886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223671221 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223671121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111835610 + 111835611.

It is an arithmetic number, because the mean of its divisors is an integer number (111835611).

Almost surely, 2^223671221 is an apocalyptic number.

It is an amenable number.

223671221 is a deficient number, since it is larger than the sum of its proper divisors (1).

223671221 is an equidigital number, since it uses as much as digits as its factorization.

223671221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 26.

The square root of 223671221 is about 14955.6417782722. The cubic root of 223671221 is about 607.0205159407.

The spelling of 223671221 in words is "two hundred twenty-three million, six hundred seventy-one thousand, two hundred twenty-one".