11721226579 has 4 divisors (see below), whose sum is σ = 11721490720. Its totient is φ = 11720962440.

The previous prime is 11721226547. The next prime is 11721226591. The reversal of 11721226579 is 97562212711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97562212711 = 1259 ⋅77491829.

It is a cyclic number.

It is not a de Polignac number, because 11721226579 - 2⁵ = 11721226547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11721226519) 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 in 3 ways as a sum of consecutive naturals, for example, 47424 + ... + 160285.

It is an arithmetic number, because the mean of its divisors is an integer number (2930372680).

Almost surely, 2^11721226579 is an apocalyptic number.

11721226579 is a deficient number, since it is larger than the sum of its proper divisors (264141).

11721226579 is an equidigital number, since it uses as much as digits as its factorization.

11721226579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264140.

The product of its digits is 105840, while the sum is 43.

The spelling of 11721226579 in words is "eleven billion, seven hundred twenty-one million, two hundred twenty-six thousand, five hundred seventy-nine".