221431222 has 12 divisors (see below), whose sum is σ = 352835100. Its totient is φ = 104202656.

The previous prime is 221431219. The next prime is 221431253. The reversal of 221431222 is 222134122.

It is a self number, because there is not a number n which added to its sum of digits gives 221431222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 190972 + ... + 192127.

It is an arithmetic number, because the mean of its divisors is an integer number (29402925).

Almost surely, 2^221431222 is an apocalyptic number.

221431222 is a deficient number, since it is larger than the sum of its proper divisors (131403878).

221431222 is a wasteful number, since it uses less digits than its factorization.

221431222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383135 (or 383118 counting only the distinct ones).

The product of its digits is 384, while the sum is 19.

The square root of 221431222 is about 14880.5652446404. The cubic root of 221431222 is about 604.9873384869.

Adding to 221431222 its reverse (222134122), we get a palindrome (443565344).

The spelling of 221431222 in words is "two hundred twenty-one million, four hundred thirty-one thousand, two hundred twenty-two".