12112001221 has 8 divisors (see below), whose sum is σ = 12422450304. Its totient is φ = 11802860160.

The previous prime is 12112001207. The next prime is 12112001233. The reversal of 12112001221 is 12210021121.

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

It is not a de Polignac number, because 12112001221 - 2⁷ = 12112001093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12112001281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308236 + ... + 345301.

It is an arithmetic number, because the mean of its divisors is an integer number (1552806288).

Almost surely, 2^12112001221 is an apocalyptic number.

It is an amenable number.

12112001221 is a deficient number, since it is larger than the sum of its proper divisors (310449083).

12112001221 is an equidigital number, since it uses as much as digits as its factorization.

12112001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654011.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12112001221 its reverse (12210021121), we get a palindrome (24322022342).

The spelling of 12112001221 in words is "twelve billion, one hundred twelve million, one thousand, two hundred twenty-one".