22381213 has 2 divisors, whose sum is σ = 22381214. Its totient is φ = 22381212.

The previous prime is 22381207. The next prime is 22381217. The reversal of 22381213 is 31218322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18292729 + 4088484 = 4277^2 + 2022^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22381213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22381217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11190606 + 11190607.

It is an arithmetic number, because the mean of its divisors is an integer number (11190607).

Almost surely, 2^22381213 is an apocalyptic number.

It is an amenable number.

22381213 is a deficient number, since it is larger than the sum of its proper divisors (1).

22381213 is an equidigital number, since it uses as much as digits as its factorization.

22381213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 22.

The square root of 22381213 is about 4730.8786710293. The cubic root of 22381213 is about 281.8131191441.

Adding to 22381213 its reverse (31218322), we get a palindrome (53599535).

The spelling of 22381213 in words is "twenty-two million, three hundred eighty-one thousand, two hundred thirteen".