11221979 has 4 divisors (see below), whose sum is σ = 11270376. Its totient is φ = 11173584.

The previous prime is 11221967. The next prime is 11221993. The reversal of 11221979 is 97912211.

11221979 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11221979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11221919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23849 + ... + 24314.

It is an arithmetic number, because the mean of its divisors is an integer number (2817594).

Almost surely, 2^11221979 is an apocalyptic number.

11221979 is a deficient number, since it is larger than the sum of its proper divisors (48397).

11221979 is an equidigital number, since it uses as much as digits as its factorization.

11221979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48396.

The product of its digits is 2268, while the sum is 32.

The square root of 11221979 is about 3349.9222379034. The cubic root of 11221979 is about 223.8840479286.

The spelling of 11221979 in words is "eleven million, two hundred twenty-one thousand, nine hundred seventy-nine".