212212222 has 4 divisors (see below), whose sum is σ = 318318336. Its totient is φ = 106106110.

The previous prime is 212212219. The next prime is 212212243. The reversal of 212212222 is 222212212.

It is a semiprime because it is the product of two primes.

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 = 212212196 and 212212205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53053054 + ... + 53053057.

It is an arithmetic number, because the mean of its divisors is an integer number (79579584).

Almost surely, 2^212212222 is an apocalyptic number.

212212222 is a deficient number, since it is larger than the sum of its proper divisors (106106114).

212212222 is a wasteful number, since it uses less digits than its factorization.

212212222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106106113.

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

The square root of 212212222 is about 14567.5056890327. The cubic root of 212212222 is about 596.4720952849.

Adding to 212212222 its reverse (222212212), we get a palindrome (434424434).

The spelling of 212212222 in words is "two hundred twelve million, two hundred twelve thousand, two hundred twenty-two".