221672219 has 2 divisors, whose sum is σ = 221672220. Its totient is φ = 221672218.

The previous prime is 221672177. The next prime is 221672233. The reversal of 221672219 is 912276122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221672219 - 2²⁴ = 204895003 is a prime.

It is a super-2 number, since 2×221672219² = 98277145352767922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221672249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110836109 + 110836110.

It is an arithmetic number, because the mean of its divisors is an integer number (110836110).

Almost surely, 2^221672219 is an apocalyptic number.

221672219 is a deficient number, since it is larger than the sum of its proper divisors (1).

221672219 is an equidigital number, since it uses as much as digits as its factorization.

221672219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 32.

The square root of 221672219 is about 14888.6607523981. The cubic root of 221672219 is about 605.2067403549.

The spelling of 221672219 in words is "two hundred twenty-one million, six hundred seventy-two thousand, two hundred nineteen".