22773213 has 6 divisors (see below), whose sum is σ = 32894654. Its totient is φ = 15182136.

The previous prime is 22773209. The next prime is 22773221. The reversal of 22773213 is 31237722.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21930489 + 842724 = 4683^2 + 918^2 .

It is not a de Polignac number, because 22773213 - 2² = 22773209 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 (22773203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1265170 + ... + 1265187.

Almost surely, 2^22773213 is an apocalyptic number.

It is an amenable number.

22773213 is a deficient number, since it is larger than the sum of its proper divisors (10121441).

22773213 is a wasteful number, since it uses less digits than its factorization.

22773213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2530363 (or 2530360 counting only the distinct ones).

The product of its digits is 3528, while the sum is 27.

The square root of 22773213 is about 4772.1287702659. The cubic root of 22773213 is about 283.4488957276.

The spelling of 22773213 in words is "twenty-two million, seven hundred seventy-three thousand, two hundred thirteen".