12112215121 has 8 divisors (see below), whose sum is σ = 12434804424. Its totient is φ = 11790919680.

The previous prime is 12112215113. The next prime is 12112215161. The reversal of 12112215121 is 12151221121.

It can be written as a sum of positive squares in 4 ways, for example, as 20793600 + 12091421521 = 4560^2 + 109961^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 12112215121 - 2³ = 12112215113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12112215161) 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, 304480 + ... + 341953.

It is an arithmetic number, because the mean of its divisors is an integer number (1554350553).

Almost surely, 2^12112215121 is an apocalyptic number.

It is an amenable number.

12112215121 is a deficient number, since it is larger than the sum of its proper divisors (322589303).

12112215121 is an equidigital number, since it uses as much as digits as its factorization.

12112215121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646931.

The product of its digits is 80, while the sum is 19.

Adding to 12112215121 its reverse (12151221121), we get a palindrome (24263436242).

The spelling of 12112215121 in words is "twelve billion, one hundred twelve million, two hundred fifteen thousand, one hundred twenty-one".