243331000121 has 6 divisors (see below), whose sum is σ = 267463000266. Its totient is φ = 221210000000.

The previous prime is 243331000111. The next prime is 243331000141. The reversal of 243331000121 is 121000133342.

It can be written as a sum of positive squares in only one way, i.e., 243112108096 + 218892025 = 493064^2 + 14795^2 .

It is not a de Polignac number, because 243331000121 - 2¹⁸ = 243330737977 is a prime.

It is a super-2 number, since 2×243331000121² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 243331000093 and 243331000102.

It is not an unprimeable number, because it can be changed into a prime (243331000111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1005499880 + ... + 1005500121.

It is an arithmetic number, because the mean of its divisors is an integer number (44577166711).

Almost surely, 2^243331000121 is an apocalyptic number.

It is an amenable number.

243331000121 is a deficient number, since it is larger than the sum of its proper divisors (24132000145).

243331000121 is a wasteful number, since it uses less digits than its factorization.

243331000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011000023 (or 2011000012 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 243331000121 its reverse (121000133342), we get a palindrome (364331133463).

The spelling of 243331000121 in words is "two hundred forty-three billion, three hundred thirty-one million, one hundred twenty-one", and thus it is an aban number.