243121245012 has 120 divisors (see below), whose sum is σ = 647002429920. Its totient is φ = 79585122240.

The previous prime is 243121245007. The next prime is 243121245013. The reversal of 243121245012 is 210542121342.

243121245012 is a `hidden beast` number, since 2 + 4 + 31 + 2 + 124 + 501 + 2 = 666.

243121245012 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 (243121245013) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 20276083 + ... + 20288069.

It is an arithmetic number, because the mean of its divisors is an integer number (5391686916).

Almost surely, 2^243121245012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243121245012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (323501214960).

243121245012 is an abundant number, since it is smaller than the sum of its proper divisors (403881184908).

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

243121245012 is a wasteful number, since it uses less digits than its factorization.

243121245012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13123 (or 13112 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 243121245012 its reverse (210542121342), we get a palindrome (453663366354).

The spelling of 243121245012 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-five thousand, twelve".