12112812521 has 2 divisors, whose sum is σ = 12112812522. Its totient is φ = 12112812520.

The previous prime is 12112812487. The next prime is 12112812527. The reversal of 12112812521 is 12521821121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11474694400 + 638118121 = 107120^2 + 25261^2 .

It is a cyclic number.

It is not a de Polignac number, because 12112812521 - 2¹⁰ = 12112811497 is a prime.

It is not a weakly prime, because it can be changed into another prime (12112812527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6056406260 + 6056406261.

It is an arithmetic number, because the mean of its divisors is an integer number (6056406261).

Almost surely, 2^12112812521 is an apocalyptic number.

It is an amenable number.

12112812521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12112812521 is an equidigital number, since it uses as much as digits as its factorization.

12112812521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 640, while the sum is 26.

The spelling of 12112812521 in words is "twelve billion, one hundred twelve million, eight hundred twelve thousand, five hundred twenty-one".