221838879 has 8 divisors (see below), whose sum is σ = 300798720. Its totient is φ = 145385816.

The previous prime is 221838863. The next prime is 221838913. The reversal of 221838879 is 978838122.

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 221838879 - 2⁴ = 221838863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221838079) 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, 626487 + ... + 626840.

It is an arithmetic number, because the mean of its divisors is an integer number (37599840).

Almost surely, 2^221838879 is an apocalyptic number.

221838879 is a deficient number, since it is larger than the sum of its proper divisors (78959841).

221838879 is a wasteful number, since it uses less digits than its factorization.

221838879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1253389.

The product of its digits is 387072, while the sum is 48.

The square root of 221838879 is about 14894.2565776208. The cubic root of 221838879 is about 605.3583733815.

The spelling of 221838879 in words is "two hundred twenty-one million, eight hundred thirty-eight thousand, eight hundred seventy-nine".