1221132212112 has 40 divisors (see below), whose sum is σ = 3157005322656. Its totient is φ = 406732615936.

The previous prime is 1221132212071. The next prime is 1221132212123. The reversal of 1221132212112 is 2112122311221.

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, 9669573 + ... + 9795044.

Almost surely, 2^{1221132212112} is an apocalyptic number.

1221132212112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221132212112 is an abundant number, since it is smaller than the sum of its proper divisors (1935873110544).

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

1221132212112 is a wasteful number, since it uses less digits than its factorization.

1221132212112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19465935 (or 19465929 counting only the distinct ones).

The product of its digits is 192, while the sum is 21.

Adding to 1221132212112 its reverse (2112122311221), we get a palindrome (3333254523333).

The spelling of 1221132212112 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-two million, two hundred twelve thousand, one hundred twelve".