12012112221 has 16 divisors (see below), whose sum is σ = 16917288960. Its totient is φ = 7569520560.

The previous prime is 12012112213. The next prime is 12012112237. The reversal of 12012112221 is 12221121021.

It is not a de Polignac number, because 12012112221 - 2³ = 12012112213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12012112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012112201) 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, 1497891 + ... + 1505888.

It is an arithmetic number, because the mean of its divisors is an integer number (1057330560).

Almost surely, 2^12012112221 is an apocalyptic number.

It is an amenable number.

12012112221 is a deficient number, since it is larger than the sum of its proper divisors (4905176739).

12012112221 is a wasteful number, since it uses less digits than its factorization.

12012112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3003856.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 12012112221 its reverse (12221121021), we get a palindrome (24233233242).

The spelling of 12012112221 in words is "twelve billion, twelve million, one hundred twelve thousand, two hundred twenty-one".