221666119 has 2 divisors, whose sum is σ = 221666120. Its totient is φ = 221666118.

The previous prime is 221666117. The next prime is 221666129. The reversal of 221666119 is 911666122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221666119 - 2¹ = 221666117 is a prime.

It is a super-2 number, since 2×221666119² = 98271736625044322, which contains 22 as substring.

Together with 221666117, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221666113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110833059 + 110833060.

It is an arithmetic number, because the mean of its divisors is an integer number (110833060).

Almost surely, 2^221666119 is an apocalyptic number.

221666119 is a deficient number, since it is larger than the sum of its proper divisors (1).

221666119 is an equidigital number, since it uses as much as digits as its factorization.

221666119 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 34.

The square root of 221666119 is about 14888.4558971036. The cubic root of 221666119 is about 605.2011889226.

The spelling of 221666119 in words is "two hundred twenty-one million, six hundred sixty-six thousand, one hundred nineteen".