22309213 has 2 divisors, whose sum is σ = 22309214. Its totient is φ = 22309212.

The previous prime is 22309171. The next prime is 22309271. The reversal of 22309213 is 31290322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16345849 + 5963364 = 4043^2 + 2442^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22309213 is a prime.

It is a super-3 number, since 3×22309213³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22309283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11154606 + 11154607.

It is an arithmetic number, because the mean of its divisors is an integer number (11154607).

Almost surely, 2^22309213 is an apocalyptic number.

It is an amenable number.

22309213 is a deficient number, since it is larger than the sum of its proper divisors (1).

22309213 is an equidigital number, since it uses as much as digits as its factorization.

22309213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 22309213 is about 4723.2629611318. The cubic root of 22309213 is about 281.5105984292.

Adding to 22309213 its reverse (31290322), we get a palindrome (53599535).

It can be divided in two parts, 22309 and 213, that added together give a palindrome (22522).

The spelling of 22309213 in words is "twenty-two million, three hundred nine thousand, two hundred thirteen".