212222111220 has 144 divisors (see below), whose sum is σ = 746065651968. Its totient is φ = 47824680960.

The previous prime is 212222111141. The next prime is 212222111263. The reversal of 212222111220 is 22111222212.

It is a happy number.

212222111220 is a `hidden beast` number, since 212 + 2 + 221 + 11 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 212222111193 and 212222111202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1096669 + ... + 1275588.

It is an arithmetic number, because the mean of its divisors is an integer number (5181011472).

Almost surely, 2^212222111220 is an apocalyptic number.

212222111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212222111220 is an abundant number, since it is smaller than the sum of its proper divisors (533843540748).

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

212222111220 is a wasteful number, since it uses less digits than its factorization.

212222111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2372350 (or 2372345 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 212222111220 its reverse (22111222212), we get a palindrome (234333333432).

The spelling of 212222111220 in words is "two hundred twelve billion, two hundred twenty-two million, one hundred eleven thousand, two hundred twenty".