243221140 has 24 divisors (see below), whose sum is σ = 511295400. Its totient is φ = 97187328.

The previous prime is 243221107. The next prime is 243221161. The reversal of 243221140 is 41122342.

It can be written as a sum of positive squares in 4 ways, for example, as 134977924 + 108243216 = 11618^2 + 10404^2 .

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, 15184 + ... + 26776.

It is an arithmetic number, because the mean of its divisors is an integer number (21303975).

Almost surely, 2^243221140 is an apocalyptic number.

243221140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243221140 is an abundant number, since it is smaller than the sum of its proper divisors (268074260).

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

243221140 is a wasteful number, since it uses less digits than its factorization.

243221140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12651 (or 12649 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 243221140 is about 15595.5487239148. The cubic root of 243221140 is about 624.2143857101.

Adding to 243221140 its reverse (41122342), we get a palindrome (284343482).

The spelling of 243221140 in words is "two hundred forty-three million, two hundred twenty-one thousand, one hundred forty".