221990222 has 4 divisors (see below), whose sum is σ = 332985336. Its totient is φ = 110995110.

The previous prime is 221990207. The next prime is 221990231. The reversal of 221990222 is 222099122.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55497554 + ... + 55497557.

It is an arithmetic number, because the mean of its divisors is an integer number (83246334).

Almost surely, 2^221990222 is an apocalyptic number.

221990222 is a deficient number, since it is larger than the sum of its proper divisors (110995114).

221990222 is a wasteful number, since it uses less digits than its factorization.

221990222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110995113.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 221990222 is about 14899.3362939428. The cubic root of 221990222 is about 605.4960046905.

Subtracting 221990222 from its reverse (222099122), we obtain a square (108900 = 330²).

The spelling of 221990222 in words is "two hundred twenty-one million, nine hundred ninety thousand, two hundred twenty-two".