212121595913 has 2 divisors, whose sum is σ = 212121595914. Its totient is φ = 212121595912.

The previous prime is 212121595843. The next prime is 212121595919. The reversal of 212121595913 is 319595121212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195234073609 + 16887522304 = 441853^2 + 129952^2 .

It is a cyclic number.

It is not a de Polignac number, because 212121595913 - 2²⁶ = 212054487049 is a prime.

It is not a weakly prime, because it can be changed into another prime (212121595919) 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, 106060797956 + 106060797957.

It is an arithmetic number, because the mean of its divisors is an integer number (106060797957).

Almost surely, 2^212121595913 is an apocalyptic number.

It is an amenable number.

212121595913 is a deficient number, since it is larger than the sum of its proper divisors (1).

212121595913 is an equidigital number, since it uses as much as digits as its factorization.

212121595913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48600, while the sum is 41.

The spelling of 212121595913 in words is "two hundred twelve billion, one hundred twenty-one million, five hundred ninety-five thousand, nine hundred thirteen".