221443140 has 48 divisors (see below), whose sum is σ = 621129600. Its totient is φ = 58947840.

The previous prime is 221443133. The next prime is 221443153. The reversal of 221443140 is 41344122.

221443140 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34936 + ... + 40784.

It is an arithmetic number, because the mean of its divisors is an integer number (12940200).

Almost surely, 2^221443140 is an apocalyptic number.

221443140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221443140 is an abundant number, since it is smaller than the sum of its proper divisors (399686460).

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

221443140 is a wasteful number, since it uses less digits than its factorization.

221443140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6492 (or 6490 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 221443140 is about 14880.9656944702. The cubic root of 221443140 is about 604.9981922857.

Adding to 221443140 its reverse (41344122), we get a palindrome (262787262).

It can be divided in two parts, 2214 and 43140, that added together give a palindrome (45354).

The spelling of 221443140 in words is "two hundred twenty-one million, four hundred forty-three thousand, one hundred forty".