22421818 has 16 divisors (see below), whose sum is σ = 34394400. Its totient is φ = 10959696.

The previous prime is 22421813. The next prime is 22421821. The reversal of 22421818 is 81812422.

It is not an unprimeable number, because it can be changed into a prime (22421813) 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 7 ways as a sum of consecutive naturals, for example, 19405 + ... + 20527.

It is an arithmetic number, because the mean of its divisors is an integer number (2149650).

Almost surely, 2^22421818 is an apocalyptic number.

22421818 is a deficient number, since it is larger than the sum of its proper divisors (11972582).

22421818 is a wasteful number, since it uses less digits than its factorization.

22421818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1341.

The product of its digits is 2048, while the sum is 28.

The square root of 22421818 is about 4735.1682124292. The cubic root of 22421818 is about 281.9834421812.

The spelling of 22421818 in words is "twenty-two million, four hundred twenty-one thousand, eight hundred eighteen".