22215400 has 48 divisors (see below), whose sum is σ = 51966540. Its totient is φ = 8832000.

The previous prime is 22215371. The next prime is 22215409. The reversal of 22215400 is 451222.

It can be written as a sum of positive squares in 6 ways, for example, as 11600836 + 10614564 = 3406^2 + 3258^2 .

It is not an unprimeable number, because it can be changed into a prime (22215409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55200 + ... + 55600.

Almost surely, 2^22215400 is an apocalyptic number.

22215400 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 22215400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25983270).

22215400 is an abundant number, since it is smaller than the sum of its proper divisors (29751140).

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

22215400 is a wasteful number, since it uses less digits than its factorization.

22215400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694 (or 685 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 22215400 is about 4713.3215464256. The cubic root of 22215400 is about 281.1154483972.

Adding to 22215400 its reverse (451222), we get a palindrome (22666622).

The spelling of 22215400 in words is "twenty-two million, two hundred fifteen thousand, four hundred".