1221211112212 has 24 divisors (see below), whose sum is σ = 2630300857856. Its totient is φ = 483116483808.

The previous prime is 1221211112201. The next prime is 1221211112249. The reversal of 1221211112212 is 2122111121221.

It is a happy number.

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 1221211112212.

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, 1677487428 + ... + 1677488155.

Almost surely, 2^{1221211112212} is an apocalyptic number.

It is an amenable number.

1221211112212 is an abundant number, since it is smaller than the sum of its proper divisors (1409089745644).

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

1221211112212 is a wasteful number, since it uses less digits than its factorization.

1221211112212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3354975607 (or 3354975605 counting only the distinct ones).

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

Adding to 1221211112212 its reverse (2122111121221), we get a palindrome (3343322233433).

Subtracting 1221211112212 from its reverse (2122111121221), we obtain a palindrome (900900009009).

The spelling of 1221211112212 in words is "one trillion, two hundred twenty-one billion, two hundred eleven million, one hundred twelve thousand, two hundred twelve".