12111142221 has 16 divisors (see below), whose sum is σ = 17945928000. Its totient is φ = 8072522064.

The previous prime is 12111142187. The next prime is 12111142231. The reversal of 12111142221 is 12224111121.

12111142221 is a `hidden beast` number, since 1 + 211 + 11 + 422 + 21 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-12111142221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12111142194 and 12111142203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111142231) 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, 106930 + ... + 188828.

It is an arithmetic number, because the mean of its divisors is an integer number (1121620500).

Almost surely, 2^12111142221 is an apocalyptic number.

It is an amenable number.

12111142221 is a deficient number, since it is larger than the sum of its proper divisors (5834785779).

12111142221 is an equidigital number, since it uses as much as digits as its factorization.

12111142221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87385 (or 87379 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 12111142221 its reverse (12224111121), we get a palindrome (24335253342).

The spelling of 12111142221 in words is "twelve billion, one hundred eleven million, one hundred forty-two thousand, two hundred twenty-one".