243121540013 has 32 divisors (see below), whose sum is σ = 291160289280. Its totient is φ = 200543040000.

The previous prime is 243121540007. The next prime is 243121540027. The reversal of 243121540013 is 310045121342.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 243121540013 - 2⁶ = 243121539949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243121540213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 435038 + ... + 821888.

It is an arithmetic number, because the mean of its divisors is an integer number (9098759040).

Almost surely, 2^243121540013 is an apocalyptic number.

It is an amenable number.

243121540013 is a deficient number, since it is larger than the sum of its proper divisors (48038749267).

243121540013 is a wasteful number, since it uses less digits than its factorization.

243121540013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387009.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 243121540013 its reverse (310045121342), we get a palindrome (553166661355).

The spelling of 243121540013 in words is "two hundred forty-three billion, one hundred twenty-one million, five hundred forty thousand, thirteen".