212221222 has 16 divisors (see below), whose sum is σ = 341411760. Its totient is φ = 98628192.

The previous prime is 212221181. The next prime is 212221223. The reversal of 212221222 is 222122212.

212221222 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 212221196 and 212221205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212221223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50673 + ... + 54700.

It is an arithmetic number, because the mean of its divisors is an integer number (21338235).

Almost surely, 2^212221222 is an apocalyptic number.

212221222 is a deficient number, since it is larger than the sum of its proper divisors (129190538).

212221222 is a wasteful number, since it uses less digits than its factorization.

212221222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105447.

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

The square root of 212221222 is about 14567.8145924500. The cubic root of 212221222 is about 596.4805273675.

Adding to 212221222 its reverse (222122212), we get a palindrome (434343434).

It can be divided in two parts, 2122212 and 22, that multiplied together give a palindrome (46688664).

The spelling of 212221222 in words is "two hundred twelve million, two hundred twenty-one thousand, two hundred twenty-two".