221868222 has 16 divisors (see below), whose sum is σ = 450360192. Its totient is φ = 72852120.

The previous prime is 221868217. The next prime is 221868239. The reversal of 221868222 is 222868122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275554 + ... + 276357.

It is an arithmetic number, because the mean of its divisors is an integer number (28147512).

Almost surely, 2^221868222 is an apocalyptic number.

221868222 is an abundant number, since it is smaller than the sum of its proper divisors (228491970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221868222 is a wasteful number, since it uses less digits than its factorization.

221868222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551983.

The product of its digits is 12288, while the sum is 33.

The square root of 221868222 is about 14895.2415891787. The cubic root of 221868222 is about 605.3850627933.

The spelling of 221868222 in words is "two hundred twenty-one million, eight hundred sixty-eight thousand, two hundred twenty-two".