2221222709 has 4 divisors (see below), whose sum is σ = 2221667520. Its totient is φ = 2220777900.

The previous prime is 2221222699. The next prime is 2221222727. The reversal of 2221222709 is 9072221222.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9072221222 = 2 ⋅4536110611.

It is a cyclic number.

It is not a de Polignac number, because 2221222709 - 2⁸ = 2221222453 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221222789) 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, 214829 + ... + 224930.

It is an arithmetic number, because the mean of its divisors is an integer number (555416880).

Almost surely, 2^2221222709 is an apocalyptic number.

It is an amenable number.

2221222709 is a deficient number, since it is larger than the sum of its proper divisors (444811).

2221222709 is an equidigital number, since it uses as much as digits as its factorization.

2221222709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444810.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 2221222709 is about 47129.8494480939. The cubic root of 2221222709 is about 1304.7602029508.

The spelling of 2221222709 in words is "two billion, two hundred twenty-one million, two hundred twenty-two thousand, seven hundred nine".