243121245213 has 64 divisors (see below), whose sum is σ = 407029708800. Its totient is φ = 125398920960.

The previous prime is 243121245181. The next prime is 243121245233. The reversal of 243121245213 is 312542121342.

It is a happy number.

It is not a de Polignac number, because 243121245213 - 2⁵ = 243121245181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243121245233) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 29312295 + ... + 29320587.

It is an arithmetic number, because the mean of its divisors is an integer number (6359839200).

Almost surely, 2^243121245213 is an apocalyptic number.

It is an amenable number.

243121245213 is a deficient number, since it is larger than the sum of its proper divisors (163908463587).

243121245213 is a wasteful number, since it uses less digits than its factorization.

243121245213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9202.

The product of its digits is 11520, while the sum is 30.

Adding to 243121245213 its reverse (312542121342), we get a palindrome (555663366555).

It can be divided in two parts, 2431212 and 45213, that added together give a triangular number (2476425 = T₂₂₂₅).

The spelling of 243121245213 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-five thousand, two hundred thirteen".