22012709 has 4 divisors (see below), whose sum is σ = 22049004. Its totient is φ = 21976416.

The previous prime is 22012703. The next prime is 22012717. The reversal of 22012709 is 90721022.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6630625 + 15382084 = 2575^2 + 3922^2 .

It is a cyclic number.

It is not a de Polignac number, because 22012709 - 2⁸ = 22012453 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 (22012703) 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, 17222 + ... + 18455.

It is an arithmetic number, because the mean of its divisors is an integer number (5512251).

Almost surely, 2^22012709 is an apocalyptic number.

It is an amenable number.

22012709 is a deficient number, since it is larger than the sum of its proper divisors (36295).

22012709 is an equidigital number, since it uses as much as digits as its factorization.

22012709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36294.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 22012709 is about 4691.7703481735. The cubic root of 22012709 is about 280.2578789182.

The spelling of 22012709 in words is "twenty-two million, twelve thousand, seven hundred nine".