243121441221 has 32 divisors (see below), whose sum is σ = 365350487040. Its totient is φ = 159755425200.

The previous prime is 243121441201. The next prime is 243121441229. The reversal of 243121441221 is 122144121342.

243121441221 is a `hidden beast` number, since 2 + 4 + 31 + 214 + 412 + 2 + 1 = 666.

243121441221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 243121441221 - 2¹⁰ = 243121440197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243121441229) 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 31 ways as a sum of consecutive naturals, for example, 8195706 + ... + 8225316.

It is an arithmetic number, because the mean of its divisors is an integer number (11417202720).

Almost surely, 2^243121441221 is an apocalyptic number.

It is an amenable number.

243121441221 is a deficient number, since it is larger than the sum of its proper divisors (122229045819).

243121441221 is a wasteful number, since it uses less digits than its factorization.

243121441221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33974 (or 33968 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

Adding to 243121441221 its reverse (122144121342), we get a palindrome (365265562563).

The spelling of 243121441221 in words is "two hundred forty-three billion, one hundred twenty-one million, four hundred forty-one thousand, two hundred twenty-one".