22231213 has 4 divisors (see below), whose sum is σ = 22303008. Its totient is φ = 22159420.

The previous prime is 22231199. The next prime is 22231219. The reversal of 22231213 is 31213222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22231213 - 2⁹ = 22230701 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 (22231219) 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 in 3 ways as a sum of consecutive naturals, for example, 35431 + ... + 36052.

It is an arithmetic number, because the mean of its divisors is an integer number (5575752).

Almost surely, 2^22231213 is an apocalyptic number.

It is an amenable number.

22231213 is a deficient number, since it is larger than the sum of its proper divisors (71795).

22231213 is an equidigital number, since it uses as much as digits as its factorization.

22231213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71794.

The product of its digits is 144, while the sum is 16.

The square root of 22231213 is about 4714.9987274654. The cubic root of 22231213 is about 281.1821322334.

Adding to 22231213 its reverse (31213222), we get a palindrome (53444435).

Subtracting 22231213 from its reverse (31213222), we obtain a square (8982009 = 2997²).

The spelling of 22231213 in words is "twenty-two million, two hundred thirty-one thousand, two hundred thirteen".