22221231 has 4 divisors (see below), whose sum is σ = 29628312. Its totient is φ = 14814152.

The previous prime is 22221211. The next prime is 22221233. The reversal of 22221231 is 13212222.

It is a happy number.

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 22221231 - 2²¹ = 20124079 is a prime.

It is a super-2 number, since 2×22221231² = 987566214310722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22221231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221233) 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, 3703536 + ... + 3703541.

It is an arithmetic number, because the mean of its divisors is an integer number (7407078).

Almost surely, 2^22221231 is an apocalyptic number.

22221231 is a deficient number, since it is larger than the sum of its proper divisors (7407081).

22221231 is an equidigital number, since it uses as much as digits as its factorization.

22221231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7407080.

The product of its digits is 96, while the sum is 15.

The square root of 22221231 is about 4713.9400717447. The cubic root of 22221231 is about 281.1400415591.

Adding to 22221231 its reverse (13212222), we get a palindrome (35433453).

Subtracting from 22221231 its reverse (13212222), we obtain a palindrome (9009009).

The spelling of 22221231 in words is "twenty-two million, two hundred twenty-one thousand, two hundred thirty-one".