221402179 has 2 divisors, whose sum is σ = 221402180. Its totient is φ = 221402178.

The previous prime is 221402177. The next prime is 221402219. The reversal of 221402179 is 971204122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221402179 - 2¹ = 221402177 is a prime.

Together with 221402177, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (221402177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110701089 + 110701090.

It is an arithmetic number, because the mean of its divisors is an integer number (110701090).

Almost surely, 2^221402179 is an apocalyptic number.

221402179 is a deficient number, since it is larger than the sum of its proper divisors (1).

221402179 is an equidigital number, since it uses as much as digits as its factorization.

221402179 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 221402179 is about 14879.5893424516. The cubic root of 221402179 is about 604.9608872103.

The spelling of 221402179 in words is "two hundred twenty-one million, four hundred two thousand, one hundred seventy-nine".