221338879 has 8 divisors (see below), whose sum is σ = 224815392. Its totient is φ = 217872480.

The previous prime is 221338829. The next prime is 221338883. The reversal of 221338879 is 978833122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221338879 - 2⁷ = 221338751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221338829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49917 + ... + 54169.

It is an arithmetic number, because the mean of its divisors is an integer number (28101924).

Almost surely, 2^221338879 is an apocalyptic number.

221338879 is a deficient number, since it is larger than the sum of its proper divisors (3476513).

221338879 is an equidigital number, since it uses as much as digits as its factorization.

221338879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5057.

The product of its digits is 145152, while the sum is 43.

The square root of 221338879 is about 14877.4621155626. The cubic root of 221338879 is about 604.9032279250.

The spelling of 221338879 in words is "two hundred twenty-one million, three hundred thirty-eight thousand, eight hundred seventy-nine".