221682319 has 2 divisors, whose sum is σ = 221682320. Its totient is φ = 221682318.

The previous prime is 221682301. The next prime is 221682341. The reversal of 221682319 is 913286122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221682319 - 2⁵ = 221682287 is a prime.

It is a super-2 number, since 2×221682319² = 98286101114435522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221682359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110841159 + 110841160.

It is an arithmetic number, because the mean of its divisors is an integer number (110841160).

Almost surely, 2^221682319 is an apocalyptic number.

221682319 is a deficient number, since it is larger than the sum of its proper divisors (1).

221682319 is an equidigital number, since it uses as much as digits as its factorization.

221682319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 34.

The square root of 221682319 is about 14888.9999328363. Note that the first 4 decimals coincide. The cubic root of 221682319 is about 605.2159318468.

The spelling of 221682319 in words is "two hundred twenty-one million, six hundred eighty-two thousand, three hundred nineteen".