12120211221 has 8 divisors (see below), whose sum is σ = 16170220704. Its totient is φ = 8075171280.

The previous prime is 12120211189. The next prime is 12120211237. The reversal of 12120211221 is 12211202121.

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

It is not a de Polignac number, because 12120211221 - 2⁵ = 12120211189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12120211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120211021) 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, 1236690 + ... + 1246451.

It is an arithmetic number, because the mean of its divisors is an integer number (2021277588).

Almost surely, 2^12120211221 is an apocalyptic number.

It is an amenable number.

12120211221 is a deficient number, since it is larger than the sum of its proper divisors (4050009483).

12120211221 is a wasteful number, since it uses less digits than its factorization.

12120211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2484771.

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

Adding to 12120211221 its reverse (12211202121), we get a palindrome (24331413342).

The spelling of 12120211221 in words is "twelve billion, one hundred twenty million, two hundred eleven thousand, two hundred twenty-one".