12012111221 has 8 divisors (see below), whose sum is σ = 13107650688. Its totient is φ = 10917160000.

The previous prime is 12012111193. The next prime is 12012111227. The reversal of 12012111221 is 12211121021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12012111221 is a prime.

It is a super-2 number, since 2×12012111221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12012111196 and 12012111205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012111227) 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, 103805 + ... + 186546.

It is an arithmetic number, because the mean of its divisors is an integer number (1638456336).

Almost surely, 2^12012111221 is an apocalyptic number.

12012111221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12012111221 is a deficient number, since it is larger than the sum of its proper divisors (1095539467).

12012111221 is a wasteful number, since it uses less digits than its factorization.

12012111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294123.

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

Adding to 12012111221 its reverse (12211121021), we get a palindrome (24223232242).

The spelling of 12012111221 in words is "twelve billion, twelve million, one hundred eleven thousand, two hundred twenty-one".