11212121513 has 2 divisors, whose sum is σ = 11212121514. Its totient is φ = 11212121512.

The previous prime is 11212121497. The next prime is 11212121551. The reversal of 11212121513 is 31512121211.

11212121513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8981731984 + 2230389529 = 94772^2 + 47227^2 .

It is a cyclic number.

It is not a de Polignac number, because 11212121513 - 2⁴ = 11212121497 is a prime.

It is not a weakly prime, because it can be changed into another prime (11212121113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5606060756 + 5606060757.

It is an arithmetic number, because the mean of its divisors is an integer number (5606060757).

Almost surely, 2^11212121513 is an apocalyptic number.

It is an amenable number.

11212121513 is a deficient number, since it is larger than the sum of its proper divisors (1).

11212121513 is an equidigital number, since it uses as much as digits as its factorization.

11212121513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120, while the sum is 20.

Adding to 11212121513 its reverse (31512121211), we get a palindrome (42724242724).

The spelling of 11212121513 in words is "eleven billion, two hundred twelve million, one hundred twenty-one thousand, five hundred thirteen".