22213440 has 140 divisors (see below), whose sum is σ = 79109316. Its totient is φ = 5916672.

The previous prime is 22213439. The next prime is 22213463. The reversal of 22213440 is 4431222.

22213440 is a `hidden beast` number, since 2 + 221 + 3 + 440 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 15116544 + 7096896 = 3888^2 + 2664^2 .

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

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 25492 + ... + 26348.

Almost surely, 2^22213440 is an apocalyptic number.

22213440 is a gapful number since it is divisible by the number (20) 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 22213440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39554658).

22213440 is an abundant number, since it is smaller than the sum of its proper divisors (56895876).

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

22213440 is an equidigital number, since it uses as much as digits as its factorization.

22213440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886 (or 867 counting only the distinct ones).

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

The square root of 22213440 is about 4713.1136205273. The cubic root of 22213440 is about 281.1071808218.

Adding to 22213440 its reverse (4431222), we get a palindrome (26644662).

The spelling of 22213440 in words is "twenty-two million, two hundred thirteen thousand, four hundred forty".