2221179209 has 4 divisors (see below), whose sum is σ = 2221458960. Its totient is φ = 2220899460.

The previous prime is 2221179197. The next prime is 2221179229. The reversal of 2221179209 is 9029711222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2221179209 - 2⁴ = 2221179193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2221179229) 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, 127607 + ... + 143964.

It is an arithmetic number, because the mean of its divisors is an integer number (555364740).

Almost surely, 2^2221179209 is an apocalyptic number.

It is an amenable number.

2221179209 is a deficient number, since it is larger than the sum of its proper divisors (279751).

2221179209 is an equidigital number, since it uses as much as digits as its factorization.

2221179209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279750.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 2221179209 is about 47129.3879548632. The cubic root of 2221179209 is about 1304.7516855039.

The spelling of 2221179209 in words is "two billion, two hundred twenty-one million, one hundred seventy-nine thousand, two hundred nine".