1221112112212 has 24 divisors (see below), whose sum is σ = 2150083418112. Its totient is φ = 606808365600.

The previous prime is 1221112112191. The next prime is 1221112112221. The reversal of 1221112112212 is 2122112111221.

It is a happy number.

It is a super-2 number, since 2×1221112112212² (a number of 25 digits) contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1221112112212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118162 + ... + 1567222.

It is an arithmetic number, because the mean of its divisors is an integer number (89586809088).

Almost surely, 2^{1221112112212} is an apocalyptic number.

It is an amenable number.

1221112112212 is a deficient number, since it is larger than the sum of its proper divisors (928971305900).

1221112112212 is a wasteful number, since it uses less digits than its factorization.

1221112112212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450359 (or 1450357 counting only the distinct ones).

The product of its digits is 64, while the sum is 19.

Adding to 1221112112212 its reverse (2122112111221), we get a palindrome (3343224223433).

Subtracting 1221112112212 from its reverse (2122112111221), we obtain a palindrome (900999999009).

The spelling of 1221112112212 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, one hundred twelve thousand, two hundred twelve".