12121897637 has 2 divisors, whose sum is σ = 12121897638. Its totient is φ = 12121897636.

The previous prime is 12121897631. The next prime is 12121897657. The reversal of 12121897637 is 73679812121.

12121897637 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., 12116285476 + 5612161 = 110074^2 + 2369^2 .

It is an emirp because it is prime and its reverse (73679812121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12121897637 - 2¹⁶ = 12121832101 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12121897591 and 12121897600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12121897631) 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, 6060948818 + 6060948819.

It is an arithmetic number, because the mean of its divisors is an integer number (6060948819).

Almost surely, 2^12121897637 is an apocalyptic number.

It is an amenable number.

12121897637 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121897637 is an equidigital number, since it uses as much as digits as its factorization.

12121897637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 47.

The spelling of 12121897637 in words is "twelve billion, one hundred twenty-one million, eight hundred ninety-seven thousand, six hundred thirty-seven".