22726213 has 4 divisors (see below), whose sum is σ = 22760460. Its totient is φ = 22691968.

The previous prime is 22726181. The next prime is 22726217. The reversal of 22726213 is 31262722.

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 13380964 + 9345249 = 3658^2 + 3057^2 .

It is a cyclic number.

It is not a de Polignac number, because 22726213 - 2⁵ = 22726181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22726217) 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, 16108 + ... + 17461.

It is an arithmetic number, because the mean of its divisors is an integer number (5690115).

Almost surely, 2^22726213 is an apocalyptic number.

It is an amenable number.

22726213 is a deficient number, since it is larger than the sum of its proper divisors (34247).

22726213 is an equidigital number, since it uses as much as digits as its factorization.

22726213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34246.

The product of its digits is 2016, while the sum is 25.

The square root of 22726213 is about 4767.2017997983. The cubic root of 22726213 is about 283.2537648156.

Adding to 22726213 its reverse (31262722), we get a palindrome (53988935).

The spelling of 22726213 in words is "twenty-two million, seven hundred twenty-six thousand, two hundred thirteen".