12111201221 has 16 divisors (see below), whose sum is σ = 14092130304. Its totient is φ = 10194462384.

The previous prime is 12111201209. The next prime is 12111201253. The reversal of 12111201221 is 12210211121.

It is not a de Polignac number, because 12111201221 - 2²² = 12107006917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12111201196 and 12111201205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111261221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34616 + ... + 159438.

It is an arithmetic number, because the mean of its divisors is an integer number (880758144).

Almost surely, 2^12111201221 is an apocalyptic number.

It is an amenable number.

12111201221 is a deficient number, since it is larger than the sum of its proper divisors (1980929083).

12111201221 is a wasteful number, since it uses less digits than its factorization.

12111201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125080.

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

Adding to 12111201221 its reverse (12210211121), we get a palindrome (24321412342).

The spelling of 12111201221 in words is "twelve billion, one hundred eleven million, two hundred one thousand, two hundred twenty-one".