22231224 has 48 divisors (see below), whose sum is σ = 60694920. Its totient is φ = 7350720.

The previous prime is 22231219. The next prime is 22231241. The reversal of 22231224 is 42213222.

It is a Cunningham number, because it is equal to 4715²-1.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 22231197 and 22231206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8254 + ... + 10610.

Almost surely, 2^22231224 is an apocalyptic number.

22231224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22231224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30347460).

22231224 is an abundant number, since it is smaller than the sum of its proper divisors (38463696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22231224 is a wasteful number, since it uses less digits than its factorization.

22231224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2500 (or 2493 counting only the distinct ones).

The product of its digits is 384, while the sum is 18.

The square root of 22231224 is about 4714.9998939555. Note that the first 3 decimals coincide. The cubic root of 22231224 is about 281.1821786096.

Adding to 22231224 its reverse (42213222), we get a palindrome (64444446).

The spelling of 22231224 in words is "twenty-two million, two hundred thirty-one thousand, two hundred twenty-four".