1221112133312 has 28 divisors (see below), whose sum is σ = 2550678307320. Its totient is φ = 578421536256.

The previous prime is 1221112133299. The next prime is 1221112133317. The reversal of 1221112133312 is 2133312111221.

It is a happy number.

It is a super-2 number, since 2×1221112133312² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221112133317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 502100813 + ... + 502103244.

Almost surely, 2^{1221112133312} is an apocalyptic number.

It is an amenable number.

1221112133312 is an abundant number, since it is smaller than the sum of its proper divisors (1329566174008).

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

1221112133312 is a wasteful number, since it uses less digits than its factorization.

1221112133312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004204088 (or 1004204078 counting only the distinct ones).

The product of its digits is 432, while the sum is 23.

Adding to 1221112133312 its reverse (2133312111221), we get a palindrome (3354424244533).

The spelling of 1221112133312 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, one hundred thirty-three thousand, three hundred twelve".