221719 has 2 divisors, whose sum is σ = 221720. Its totient is φ = 221718.

The previous prime is 221717. The next prime is 221723. The reversal of 221719 is 917122.

221719 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221719 - 2¹ = 221717 is a prime.

It is a super-2 number, since 2×221719² = 98318629922, which contains 22 as substring.

Together with 221717, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 221719.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110859 + 110860.

It is an arithmetic number, because the mean of its divisors is an integer number (110860).

2²²¹⁷¹⁹ is an apocalyptic number.

221719 is a deficient number, since it is larger than the sum of its proper divisors (1).

221719 is an equidigital number, since it uses as much as digits as its factorization.

221719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 252, while the sum is 22.

The square root of 221719 is about 470.8704705118. The cubic root of 221719 is about 60.5249310996.

The spelling of 221719 in words is "two hundred twenty-one thousand, seven hundred nineteen".