12121239972251 has 2 divisors, whose sum is σ = 12121239972252. Its totient is φ = 12121239972250.

The previous prime is 12121239972239. The next prime is 12121239972301. The reversal of 12121239972251 is 15227993212121.

12121239972251 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 is a cyclic number.

It is not a de Polignac number, because 12121239972251 - 2¹⁰ = 12121239971227 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12121239972196 and 12121239972205.

It is not a weakly prime, because it can be changed into another prime (12121239972851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060619986125 + 6060619986126.

It is an arithmetic number, because the mean of its divisors is an integer number (6060619986126).

Almost surely, 2^{12121239972251} is an apocalyptic number.

12121239972251 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121239972251 is an equidigital number, since it uses as much as digits as its factorization.

12121239972251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 47.

The spelling of 12121239972251 in words is "twelve trillion, one hundred twenty-one billion, two hundred thirty-nine million, nine hundred seventy-two thousand, two hundred fifty-one".