213121131239 has 2 divisors, whose sum is σ = 213121131240. Its totient is φ = 213121131238.

The previous prime is 213121131199. The next prime is 213121131247. The reversal of 213121131239 is 932131121312.

213121131239 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213121131239 - 2²⁰ = 213120082663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213121139239) 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 as a sum of consecutive naturals, namely, 106560565619 + 106560565620.

It is an arithmetic number, because the mean of its divisors is an integer number (106560565620).

Almost surely, 2^213121131239 is an apocalyptic number.

213121131239 is a deficient number, since it is larger than the sum of its proper divisors (1).

213121131239 is an equidigital number, since it uses as much as digits as its factorization.

213121131239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 29.

The spelling of 213121131239 in words is "two hundred thirteen billion, one hundred twenty-one million, one hundred thirty-one thousand, two hundred thirty-nine".