73121331011 has 2 divisors, whose sum is σ = 73121331012. Its totient is φ = 73121331010.

The previous prime is 73121331001. The next prime is 73121331029. The reversal of 73121331011 is 11013312137.

It is a weak prime.

It is an emirp because it is prime and its reverse (11013312137) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73121331011 is a prime.

It is not a weakly prime, because it can be changed into another prime (73121331001) 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, 36560665505 + 36560665506.

It is an arithmetic number, because the mean of its divisors is an integer number (36560665506).

Almost surely, 2^73121331011 is an apocalyptic number.

73121331011 is a deficient number, since it is larger than the sum of its proper divisors (1).

73121331011 is an equidigital number, since it uses as much as digits as its factorization.

73121331011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 23.

Adding to 73121331011 its reverse (11013312137), we get a palindrome (84134643148).

The spelling of 73121331011 in words is "seventy-three billion, one hundred twenty-one million, three hundred thirty-one thousand, eleven".