123121333243 has 2 divisors, whose sum is σ = 123121333244. Its totient is φ = 123121333242.

The previous prime is 123121333199. The next prime is 123121333253. The reversal of 123121333243 is 342333121321.

It is a strong prime.

It is an emirp because it is prime and its reverse (342333121321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123121333243 is a prime.

It is not a weakly prime, because it can be changed into another prime (123121333253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61560666621 + 61560666622.

It is an arithmetic number, because the mean of its divisors is an integer number (61560666622).

Almost surely, 2^123121333243 is an apocalyptic number.

123121333243 is a deficient number, since it is larger than the sum of its proper divisors (1).

123121333243 is an equidigital number, since it uses as much as digits as its factorization.

123121333243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 28.

Adding to 123121333243 its reverse (342333121321), we get a palindrome (465454454564).

The spelling of 123121333243 in words is "one hundred twenty-three billion, one hundred twenty-one million, three hundred thirty-three thousand, two hundred forty-three".