12121241243 has 4 divisors (see below), whose sum is σ = 12132645168. Its totient is φ = 12109837320.

The previous prime is 12121241219. The next prime is 12121241263. The reversal of 12121241243 is 34214212121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34214212121 = 17 ⋅2012600713.

It is a cyclic number.

It is not a de Polignac number, because 12121241243 - 2¹² = 12121237147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12121241263) 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, 5700368 + ... + 5702493.

It is an arithmetic number, because the mean of its divisors is an integer number (3033161292).

Almost surely, 2^12121241243 is an apocalyptic number.

12121241243 is a deficient number, since it is larger than the sum of its proper divisors (11403925).

12121241243 is a wasteful number, since it uses less digits than its factorization.

12121241243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11403924.

The product of its digits is 768, while the sum is 23.

Adding to 12121241243 its reverse (34214212121), we get a palindrome (46335453364).

The spelling of 12121241243 in words is "twelve billion, one hundred twenty-one million, two hundred forty-one thousand, two hundred forty-three".