12011221112 has 32 divisors (see below), whose sum is σ = 25091147520. Its totient is φ = 5343481440.

The previous prime is 12011221111. The next prime is 12011221129. The reversal of 12011221112 is 21112211021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011221111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1447898 + ... + 1456169.

It is an arithmetic number, because the mean of its divisors is an integer number (784098360).

Almost surely, 2^12011221112 is an apocalyptic number.

It is an amenable number.

12011221112 is an abundant number, since it is smaller than the sum of its proper divisors (13079926408).

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

12011221112 is a wasteful number, since it uses less digits than its factorization.

12011221112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2904131 (or 2904127 counting only the distinct ones).

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

Adding to 12011221112 its reverse (21112211021), we get a palindrome (33123432133).

The spelling of 12011221112 in words is "twelve billion, eleven million, two hundred twenty-one thousand, one hundred twelve".