222021440 has 56 divisors (see below), whose sum is σ = 531083520. Its totient is φ = 88406528.

The previous prime is 222021439. The next prime is 222021463. The reversal of 222021440 is 44120222.

It is a happy number.

222021440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75029 + ... + 77931.

Almost surely, 2^222021440 is an apocalyptic number.

222021440 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 222021440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265541760).

222021440 is an abundant number, since it is smaller than the sum of its proper divisors (309062080).

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

222021440 is a wasteful number, since it uses less digits than its factorization.

222021440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3159 (or 3149 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 222021440 is about 14900.3838876722. The cubic root of 222021440 is about 605.5243865536.

Adding to 222021440 its reverse (44120222), we get a palindrome (266141662).

The spelling of 222021440 in words is "two hundred twenty-two million, twenty-one thousand, four hundred forty".