243121235212 has 12 divisors (see below), whose sum is σ = 425534844280. Its totient is φ = 121539851136.

The previous prime is 243121235183. The next prime is 243121235213. The reversal of 243121235212 is 212532121342.

It is a happy number.

It is a super-2 number, since 2×243121235212² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (243121235213) 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, 5165262 + ... + 5212117.

Almost surely, 2^243121235212 is an apocalyptic number.

It is an amenable number.

243121235212 is a deficient number, since it is larger than the sum of its proper divisors (182413609068).

243121235212 is a wasteful number, since it uses less digits than its factorization.

243121235212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10383240 (or 10383238 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

Adding to 243121235212 its reverse (212532121342), we get a palindrome (455653356554).

The spelling of 243121235212 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred thirty-five thousand, two hundred twelve".