11101212723509 has 2 divisors, whose sum is σ = 11101212723510. Its totient is φ = 11101212723508.

The previous prime is 11101212723493. The next prime is 11101212723571. The reversal of 11101212723509 is 90532721210111.

11101212723509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10755612180625 + 345600542884 = 3279575^2 + 587878^2 .

It is a cyclic number.

It is not a de Polignac number, because 11101212723509 - 2⁴ = 11101212723493 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11101212723589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5550606361754 + 5550606361755.

It is an arithmetic number, because the mean of its divisors is an integer number (5550606361755).

Almost surely, 2^{11101212723509} is an apocalyptic number.

It is an amenable number.

11101212723509 is a deficient number, since it is larger than the sum of its proper divisors (1).

11101212723509 is an equidigital number, since it uses as much as digits as its factorization.

11101212723509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 35.

The spelling of 11101212723509 in words is "eleven trillion, one hundred one billion, two hundred twelve million, seven hundred twenty-three thousand, five hundred nine".