121212347 has 2 divisors, whose sum is σ = 121212348. Its totient is φ = 121212346.

The previous prime is 121212341. The next prime is 121212349. The reversal of 121212347 is 743212121.

It is a strong prime.

It is an emirp because it is prime and its reverse (743212121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121212347 - 2¹⁰ = 121211323 is a prime.

Together with 121212349, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (121212341) 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, 60606173 + 60606174.

It is an arithmetic number, because the mean of its divisors is an integer number (60606174).

Almost surely, 2^121212347 is an apocalyptic number.

121212347 is a deficient number, since it is larger than the sum of its proper divisors (1).

121212347 is an equidigital number, since it uses as much as digits as its factorization.

121212347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 23.

The square root of 121212347 is about 11009.6479053601. The cubic root of 121212347 is about 494.8979104499.

Adding to 121212347 its reverse (743212121), we get a palindrome (864424468).

The spelling of 121212347 in words is "one hundred twenty-one million, two hundred twelve thousand, three hundred forty-seven".