121212343 has 8 divisors (see below), whose sum is σ = 145819520. Its totient is φ = 98427960.

The previous prime is 121212341. The next prime is 121212347. The reversal of 121212343 is 343212121.

It is a happy number.

121212343 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121212343 - 2¹ = 121212341 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

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

It is a self number, because there is not a number n which added to its sum of digits gives 121212343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a 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 in 7 ways as a sum of consecutive naturals, for example, 455553 + ... + 455818.

It is an arithmetic number, because the mean of its divisors is an integer number (18227440).

Almost surely, 2^121212343 is an apocalyptic number.

121212343 is a deficient number, since it is larger than the sum of its proper divisors (24607177).

121212343 is an equidigital number, since it uses as much as digits as its factorization.

121212343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911397.

The product of its digits is 288, while the sum is 19.

The square root of 121212343 is about 11009.6477237012. The cubic root of 121212343 is about 494.8979050061.

Adding to 121212343 its reverse (343212121), we get a palindrome (464424464).

The spelling of 121212343 in words is "one hundred twenty-one million, two hundred twelve thousand, three hundred forty-three".