1221121111112 has 32 divisors (see below), whose sum is σ = 2616816947520. Its totient is φ = 523311848640.

The previous prime is 1221121111103. The next prime is 1221121111141. The reversal of 1221121111112 is 2111111211221.

It is a super-2 number, since 2×1221121111112² (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 an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 633062 + ... + 1686122.

It is an arithmetic number, because the mean of its divisors is an integer number (81775529610).

Almost surely, 2^{1221121111112} is an apocalyptic number.

It is an amenable number.

1221121111112 is an abundant number, since it is smaller than the sum of its proper divisors (1395695836408).

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

1221121111112 is a wasteful number, since it uses less digits than its factorization.

1221121111112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073781 (or 1073777 counting only the distinct ones).

The product of its digits is 16, while the sum is 17.

Adding to 1221121111112 its reverse (2111111211221), we get a palindrome (3332232322333).

The spelling of 1221121111112 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred eleven thousand, one hundred twelve".