243121243212 has 36 divisors (see below), whose sum is σ = 614584701640. Its totient is φ = 81036692352.

The previous prime is 243121243201. The next prime is 243121243213. The reversal of 243121243212 is 212342121342.

243121243212 is a `hidden beast` number, since 2 + 4 + 3 + 1 + 212 + 432 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (243121243213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 704964 + ... + 991572.

Almost surely, 2^243121243212 is an apocalyptic number.

It is an amenable number.

243121243212 is an abundant number, since it is smaller than the sum of its proper divisors (371463458428).

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

243121243212 is a wasteful number, since it uses less digits than its factorization.

243121243212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310182 (or 310177 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 243121243212 its reverse (212342121342), we get a palindrome (455463364554).

The spelling of 243121243212 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-three thousand, two hundred twelve".