11721226547 has 2 divisors, whose sum is σ = 11721226548. Its totient is φ = 11721226546.

The previous prime is 11721226541. The next prime is 11721226591. The reversal of 11721226547 is 74562212711.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11721226547 - 2³⁰ = 10647484723 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11721226547.

It is not a weakly prime, because it can be changed into another prime (11721226541) 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, 5860613273 + 5860613274.

It is an arithmetic number, because the mean of its divisors is an integer number (5860613274).

Almost surely, 2^11721226547 is an apocalyptic number.

11721226547 is a deficient number, since it is larger than the sum of its proper divisors (1).

11721226547 is an equidigital number, since it uses as much as digits as its factorization.

11721226547 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47040, while the sum is 38.

The spelling of 11721226547 in words is "eleven billion, seven hundred twenty-one million, two hundred twenty-six thousand, five hundred forty-seven".