12112501221 has 6 divisors (see below), whose sum is σ = 17495835110. Its totient is φ = 8075000808.

The previous prime is 12112501217. The next prime is 12112501223. The reversal of 12112501221 is 12210521121.

It can be written as a sum of positive squares in only one way, i.e., 10766345121 + 1346156100 = 103761^2 + 36690^2 .

It is not a de Polignac number, because 12112501221 - 2² = 12112501217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12112501194 and 12112501203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12112501223) 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 5 ways as a sum of consecutive naturals, for example, 672916726 + ... + 672916743.

Almost surely, 2^12112501221 is an apocalyptic number.

It is an amenable number.

12112501221 is a deficient number, since it is larger than the sum of its proper divisors (5383333889).

12112501221 is a wasteful number, since it uses less digits than its factorization.

12112501221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1345833475 (or 1345833472 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The spelling of 12112501221 in words is "twelve billion, one hundred twelve million, five hundred one thousand, two hundred twenty-one".