22724213 has 4 divisors (see below), whose sum is σ = 22783020. Its totient is φ = 22665408.

The previous prime is 22724183. The next prime is 22724231. The reversal of 22724213 is 31242722.

It is a happy number.

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 13712209 + 9012004 = 3703^2 + 3002^2 .

It is a cyclic number.

It is not a de Polignac number, because 22724213 - 2¹⁴ = 22707829 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 (22724813) 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, 28820 + ... + 29597.

It is an arithmetic number, because the mean of its divisors is an integer number (5695755).

Almost surely, 2^22724213 is an apocalyptic number.

It is an amenable number.

22724213 is a deficient number, since it is larger than the sum of its proper divisors (58807).

22724213 is an equidigital number, since it uses as much as digits as its factorization.

22724213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58806.

The product of its digits is 1344, while the sum is 23.

The square root of 22724213 is about 4766.9920285228. The cubic root of 22724213 is about 283.2454554073.

Adding to 22724213 its reverse (31242722), we get a palindrome (53966935).

The spelling of 22724213 in words is "twenty-two million, seven hundred twenty-four thousand, two hundred thirteen".