221998222 has 8 divisors (see below), whose sum is σ = 333486936. Its totient is φ = 110835912.

The previous prime is 221998201. The next prime is 221998243. The reversal of 221998222 is 222899122.

It is an interprime number because it is at equal distance from previous prime (221998201) and next prime (221998243).

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

It is a super-2 number, since 2×221998222² = 98566421142322568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79893 + ... + 82624.

It is an arithmetic number, because the mean of its divisors is an integer number (41685867).

Almost surely, 2^221998222 is an apocalyptic number.

221998222 is a deficient number, since it is larger than the sum of its proper divisors (111488714).

221998222 is a wasteful number, since it uses less digits than its factorization.

221998222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163202.

The product of its digits is 20736, while the sum is 37.

The square root of 221998222 is about 14899.6047598586. The cubic root of 221998222 is about 605.5032781487.

The spelling of 221998222 in words is "two hundred twenty-one million, nine hundred ninety-eight thousand, two hundred twenty-two".