12121231100243 has 2 divisors, whose sum is σ = 12121231100244. Its totient is φ = 12121231100242.

The previous prime is 12121231100207. The next prime is 12121231100269. The reversal of 12121231100243 is 34200113212121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12121231100243 - 2²⁴ = 12121214323027 is a prime.

It is a super-4 number, since 4×12121231100243⁴ (a number of 53 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (12121236100243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060615550121 + 6060615550122.

It is an arithmetic number, because the mean of its divisors is an integer number (6060615550122).

Almost surely, 2^{12121231100243} is an apocalyptic number.

12121231100243 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121231100243 is an equidigital number, since it uses as much as digits as its factorization.

12121231100243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 12121231100243 its reverse (34200113212121), we get a palindrome (46321344312364).

The spelling of 12121231100243 in words is "twelve trillion, one hundred twenty-one billion, two hundred thirty-one million, one hundred thousand, two hundred forty-three".