22224731 has 4 divisors (see below), whose sum is σ = 22236000. Its totient is φ = 22213464.

The previous prime is 22224721. The next prime is 22224743. The reversal of 22224731 is 13742222.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 22224731 - 2⁶ = 22224667 is a prime.

It is a super-2 number, since 2×22224731² = 987877336044722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22224697 and 22224706.

It is not an unprimeable number, because it can be changed into a prime (22224721) 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, 1811 + ... + 6908.

It is an arithmetic number, because the mean of its divisors is an integer number (5559000).

Almost surely, 2^22224731 is an apocalyptic number.

22224731 is a deficient number, since it is larger than the sum of its proper divisors (11269).

22224731 is an equidigital number, since it uses as much as digits as its factorization.

22224731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11268.

The product of its digits is 1344, while the sum is 23.

The square root of 22224731 is about 4714.3112964674. The cubic root of 22224731 is about 281.1548012948.

Adding to 22224731 its reverse (13742222), we get a palindrome (35966953).

The spelling of 22224731 in words is "twenty-two million, two hundred twenty-four thousand, seven hundred thirty-one".