12120231221 has 8 divisors (see below), whose sum is σ = 13855555584. Its totient is φ = 10385872560.

The previous prime is 12120231139. The next prime is 12120231239. The reversal of 12120231221 is 12213202121.

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

It is not a de Polignac number, because 12120231221 - 2¹⁰ = 12120230197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12120231221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120231241) 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, 214325 + ... + 264906.

It is an arithmetic number, because the mean of its divisors is an integer number (1731944448).

Almost surely, 2^12120231221 is an apocalyptic number.

It is an amenable number.

12120231221 is a deficient number, since it is larger than the sum of its proper divisors (1735324363).

12120231221 is an equidigital number, since it uses as much as digits as its factorization.

12120231221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482851.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 12120231221 its reverse (12213202121), we get a palindrome (24333433342).

The spelling of 12120231221 in words is "twelve billion, one hundred twenty million, two hundred thirty-one thousand, two hundred twenty-one".