221222212 has 12 divisors (see below), whose sum is σ = 394443756. Its totient is φ = 108524000.

The previous prime is 221222203. The next prime is 221222213. The reversal of 221222212 is 212222122.

221222212 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 90897156 + 130325056 = 9534^2 + 11416^2 .

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (221222213) 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, 521539 + ... + 521962.

It is an arithmetic number, because the mean of its divisors is an integer number (32870313).

Almost surely, 2^221222212 is an apocalyptic number.

It is an amenable number.

221222212 is a deficient number, since it is larger than the sum of its proper divisors (173221544).

221222212 is a wasteful number, since it uses less digits than its factorization.

221222212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043558 (or 1043556 counting only the distinct ones).

The product of its digits is 128, while the sum is 16.

The square root of 221222212 is about 14873.5406679109. The cubic root of 221222212 is about 604.7969284077.

Adding to 221222212 its reverse (212222122), we get a palindrome (433444334).

It can be divided in two parts, 2 and 21222212, that multiplied together give a palindrome (42444424).

The spelling of 221222212 in words is "two hundred twenty-one million, two hundred twenty-two thousand, two hundred twelve".