221222312 has 16 divisors (see below), whose sum is σ = 416966400. Its totient is φ = 110031280.

The previous prime is 221222311. The next prime is 221222327. The reversal of 221222312 is 213222122.

It is a super-2 number, since 2×221222312² = 97878622653250688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221222311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70862 + ... + 73917.

It is an arithmetic number, because the mean of its divisors is an integer number (26060400).

Almost surely, 2^221222312 is an apocalyptic number.

It is an amenable number.

221222312 is a deficient number, since it is larger than the sum of its proper divisors (195744088).

221222312 is a wasteful number, since it uses less digits than its factorization.

221222312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144976 (or 144972 counting only the distinct ones).

The product of its digits is 192, while the sum is 17.

The square root of 221222312 is about 14873.5440295849. The cubic root of 221222312 is about 604.7970195373.

Adding to 221222312 its reverse (213222122), we get a palindrome (434444434).

The spelling of 221222312 in words is "two hundred twenty-one million, two hundred twenty-two thousand, three hundred twelve".