12121345343 has 4 divisors (see below), whose sum is σ = 12122277720. Its totient is φ = 12120412968.

The previous prime is 12121345289. The next prime is 12121345349. The reversal of 12121345343 is 34354312121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12121345343 - 2⁸ = 12121345087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121345349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 446408 + ... + 472781.

It is an arithmetic number, because the mean of its divisors is an integer number (3030569430).

Almost surely, 2^12121345343 is an apocalyptic number.

12121345343 is a deficient number, since it is larger than the sum of its proper divisors (932377).

12121345343 is an equidigital number, since it uses as much as digits as its factorization.

12121345343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932376.

The product of its digits is 8640, while the sum is 29.

Adding to 12121345343 its reverse (34354312121), we get a palindrome (46475657464).

The spelling of 12121345343 in words is "twelve billion, one hundred twenty-one million, three hundred forty-five thousand, three hundred forty-three".