243121243012 has 12 divisors (see below), whose sum is σ = 425701614940. Its totient is φ = 121492210176.

The previous prime is 243121242953. The next prime is 243121243019. The reversal of 243121243012 is 210342121342.

It can be written as a sum of positive squares in 2 ways, for example, as 121170825216 + 121950417796 = 348096^2 + 349214^2 .

It is not an unprimeable number, because it can be changed into a prime (243121243019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17094837 + ... + 17109052.

Almost surely, 2^243121243012 is an apocalyptic number.

It is an amenable number.

243121243012 is a deficient number, since it is larger than the sum of its proper divisors (182580371928).

243121243012 is a wasteful number, since it uses less digits than its factorization.

243121243012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34205670 (or 34205668 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 243121243012 its reverse (210342121342), we get a palindrome (453463364354).

The spelling of 243121243012 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-three thousand, twelve".