222021400 has 48 divisors (see below), whose sum is σ = 520323840. Its totient is φ = 88099200.

The previous prime is 222021391. The next prime is 222021407. The reversal of 222021400 is 4120222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222021407) 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, 21030 + ... + 29770.

It is an arithmetic number, because the mean of its divisors is an integer number (10840080).

Almost surely, 2^222021400 is an apocalyptic number.

222021400 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 222021400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260161920).

222021400 is an abundant number, since it is smaller than the sum of its proper divisors (298302440).

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

222021400 is a wasteful number, since it uses less digits than its factorization.

222021400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8884 (or 8875 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 222021400 is about 14900.3825454248. The cubic root of 222021400 is about 605.5243501893.

Adding to 222021400 its reverse (4120222), we get a palindrome (226141622).

The spelling of 222021400 in words is "two hundred twenty-two million, twenty-one thousand, four hundred".