243121004013 has 16 divisors (see below), whose sum is σ = 335369623680. Its totient is φ = 156477537216.

The previous prime is 243121004011. The next prime is 243121004057. The reversal of 243121004013 is 310400121342.

It is not a de Polignac number, because 243121004013 - 2¹ = 243121004011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243121004011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 888456 + ... + 1129422.

It is an arithmetic number, because the mean of its divisors is an integer number (20960601480).

Almost surely, 2^243121004013 is an apocalyptic number.

It is an amenable number.

243121004013 is a deficient number, since it is larger than the sum of its proper divisors (92248619667).

243121004013 is a wasteful number, since it uses less digits than its factorization.

243121004013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252596.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 243121004013 its reverse (310400121342), we get a palindrome (553521125355).

The spelling of 243121004013 in words is "two hundred forty-three billion, one hundred twenty-one million, four thousand, thirteen".