23221418 has 32 divisors (see below), whose sum is σ = 39813120. Its totient is φ = 10062000.

The previous prime is 23221417. The next prime is 23221447. The reversal of 23221418 is 81412232.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 23221393 and 23221402.

It is not an unprimeable number, because it can be changed into a prime (23221411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53663 + ... + 54093.

It is an arithmetic number, because the mean of its divisors is an integer number (1244160).

Almost surely, 2^23221418 is an apocalyptic number.

23221418 is a deficient number, since it is larger than the sum of its proper divisors (16591702).

23221418 is a wasteful number, since it uses less digits than its factorization.

23221418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554.

The product of its digits is 768, while the sum is 23.

The square root of 23221418 is about 4818.8606537230. The cubic root of 23221418 is about 285.2963696525.

It can be divided in two parts, 232214 and 18, that added together give a palindrome (232232).

The spelling of 23221418 in words is "twenty-three million, two hundred twenty-one thousand, four hundred eighteen".