1221100112012 has 96 divisors (see below), whose sum is σ = 2496492230400. Its totient is φ = 516709843200.

The previous prime is 1221100111999. The next prime is 1221100112033. The reversal of 1221100112012 is 2102110011221.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 209772062 + ... + 209777882.

It is an arithmetic number, because the mean of its divisors is an integer number (26005127400).

Almost surely, 2^{1221100112012} is an apocalyptic number.

It is an amenable number.

1221100112012 is an abundant number, since it is smaller than the sum of its proper divisors (1275392118388).

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

1221100112012 is a wasteful number, since it uses less digits than its factorization.

1221100112012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10167 (or 10165 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221100112012 its reverse (2102110011221), we get a palindrome (3323210123233).

The spelling of 1221100112012 in words is "one trillion, two hundred twenty-one billion, one hundred million, one hundred twelve thousand, twelve".