212121110222 has 64 divisors (see below), whose sum is σ = 386340451200. Its totient is φ = 85270081536.

The previous prime is 212121110219. The next prime is 212121110231. The reversal of 212121110222 is 222011121212.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 212121110222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136939904 + ... + 136941452.

It is an arithmetic number, because the mean of its divisors is an integer number (6036569550).

Almost surely, 2^212121110222 is an apocalyptic number.

212121110222 is a deficient number, since it is larger than the sum of its proper divisors (174219340978).

212121110222 is a wasteful number, since it uses less digits than its factorization.

212121110222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3165.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 212121110222 its reverse (222011121212), we get a palindrome (434132231434).

The spelling of 212121110222 in words is "two hundred twelve billion, one hundred twenty-one million, one hundred ten thousand, two hundred twenty-two".