211212222222 has 32 divisors (see below), whose sum is σ = 447418404000. Its totient is φ = 66241107968.

The previous prime is 211212222217. The next prime is 211212222241. The reversal of 211212222222 is 222222212112.

It is a super-2 number, since 2×211212222222² (a number of 23 digits) contains 22 as substring.

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

211212222222 is a modest number, since divided by 222222 gives 211212 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20097 + ... + 650252.

It is an arithmetic number, because the mean of its divisors is an integer number (13981825125).

Almost surely, 2^211212222222 is an apocalyptic number.

211212222222 is an abundant number, since it is smaller than the sum of its proper divisors (236206181778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211212222222 is a wasteful number, since it uses less digits than its factorization.

211212222222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673460.

The product of its digits is 512, while the sum is 21.

Adding to 211212222222 its reverse (222222212112), we get a palindrome (433434434334).

The spelling of 211212222222 in words is "two hundred eleven billion, two hundred twelve million, two hundred twenty-two thousand, two hundred twenty-two".