221894479 has 2 divisors, whose sum is σ = 221894480. Its totient is φ = 221894478.

The previous prime is 221894447. The next prime is 221894507. The reversal of 221894479 is 974498122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221894479 - 2⁵ = 221894447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221894279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110947239 + 110947240.

It is an arithmetic number, because the mean of its divisors is an integer number (110947240).

Almost surely, 2^221894479 is an apocalyptic number.

221894479 is a deficient number, since it is larger than the sum of its proper divisors (1).

221894479 is an equidigital number, since it uses as much as digits as its factorization.

221894479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 46.

The square root of 221894479 is about 14896.1229519630. The cubic root of 221894479 is about 605.4089432878.

The spelling of 221894479 in words is "two hundred twenty-one million, eight hundred ninety-four thousand, four hundred seventy-nine".