243121404220 has 24 divisors (see below), whose sum is σ = 537426262800. Its totient is φ = 92130216192.

The previous prime is 243121404209. The next prime is 243121404221. The reversal of 243121404220 is 22404121342.

243121404220 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 not an unprimeable number, because it can be changed into a prime (243121404221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319896205 + ... + 319896964.

It is an arithmetic number, because the mean of its divisors is an integer number (22392760950).

Almost surely, 2^243121404220 is an apocalyptic number.

243121404220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243121404220 is an abundant number, since it is smaller than the sum of its proper divisors (294304858580).

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

243121404220 is a wasteful number, since it uses less digits than its factorization.

243121404220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639793197 (or 639793195 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 243121404220 its reverse (22404121342), we get a palindrome (265525525562).

The spelling of 243121404220 in words is "two hundred forty-three billion, one hundred twenty-one million, four hundred four thousand, two hundred twenty".