22213231 has 4 divisors (see below), whose sum is σ = 22276512. Its totient is φ = 22149952.

The previous prime is 22213183. The next prime is 22213259. The reversal of 22213231 is 13231222.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22213231 - 2⁹ = 22212719 is a prime.

It is a super-2 number, since 2×22213231² = 986855262918722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22217231) 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, 31111 + ... + 31816.

It is an arithmetic number, because the mean of its divisors is an integer number (5569128).

Almost surely, 2^22213231 is an apocalyptic number.

22213231 is a deficient number, since it is larger than the sum of its proper divisors (63281).

22213231 is an equidigital number, since it uses as much as digits as its factorization.

22213231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63280.

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

The square root of 22213231 is about 4713.0914482959. The cubic root of 22213231 is about 281.1062991996.

Adding to 22213231 its reverse (13231222), we get a palindrome (35444453).

Subtracting from 22213231 its reverse (13231222), we obtain a square (8982009 = 2997²).

The spelling of 22213231 in words is "twenty-two million, two hundred thirteen thousand, two hundred thirty-one".