13121100043 has 2 divisors, whose sum is σ = 13121100044. Its totient is φ = 13121100042.

The previous prime is 13121100037. The next prime is 13121100059. The reversal of 13121100043 is 34000112131.

It is an a-pointer prime, because the next prime (13121100059) can be obtained adding 13121100043 to its sum of digits (16).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13121100043 - 2⁹ = 13121099531 is a prime.

It is not a weakly prime, because it can be changed into another prime (13121100073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6560550021 + 6560550022.

It is an arithmetic number, because the mean of its divisors is an integer number (6560550022).

Almost surely, 2^13121100043 is an apocalyptic number.

13121100043 is a deficient number, since it is larger than the sum of its proper divisors (1).

13121100043 is an equidigital number, since it uses as much as digits as its factorization.

13121100043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 13121100043 its reverse (34000112131), we get a palindrome (47121212174).

The spelling of 13121100043 in words is "thirteen billion, one hundred twenty-one million, one hundred thousand, forty-three".