221223187 has 2 divisors, whose sum is σ = 221223188. Its totient is φ = 221223186.

The previous prime is 221223181. The next prime is 221223203. The reversal of 221223187 is 781322122.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221223187 is a prime.

It is not a weakly prime, because it can be changed into another prime (221223181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110611593 + 110611594.

It is an arithmetic number, because the mean of its divisors is an integer number (110611594).

Almost surely, 2^221223187 is an apocalyptic number.

221223187 is a deficient number, since it is larger than the sum of its proper divisors (1).

221223187 is an equidigital number, since it uses as much as digits as its factorization.

221223187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 28.

The square root of 221223187 is about 14873.5734441996. The cubic root of 221223187 is about 604.7978169202.

The spelling of 221223187 in words is "two hundred twenty-one million, two hundred twenty-three thousand, one hundred eighty-seven".