243221001220 has 24 divisors (see below), whose sum is σ = 532971238464. Its totient is φ = 93058469856.

The previous prime is 243221001217. The next prime is 243221001241. The reversal of 243221001220 is 22100122342.

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, 264370194 + ... + 264371113.

It is an arithmetic number, because the mean of its divisors is an integer number (22207134936).

Almost surely, 2^243221001220 is an apocalyptic number.

243221001220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243221001220 is an abundant number, since it is smaller than the sum of its proper divisors (289750237244).

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

243221001220 is a wasteful number, since it uses less digits than its factorization.

243221001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528741339 (or 528741337 counting only the distinct ones).

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

Adding to 243221001220 its reverse (22100122342), we get a palindrome (265321123562).

The spelling of 243221001220 in words is "two hundred forty-three billion, two hundred twenty-one million, one thousand, two hundred twenty".