243004120421 has 4 divisors (see below), whose sum is σ = 245931880992. Its totient is φ = 240076359852.

The previous prime is 243004120399. The next prime is 243004120427. The reversal of 243004120421 is 124021400342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243004120421 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 (243004120427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1463880161 + ... + 1463880326.

It is an arithmetic number, because the mean of its divisors is an integer number (61482970248).

Almost surely, 2^243004120421 is an apocalyptic number.

It is an amenable number.

243004120421 is a deficient number, since it is larger than the sum of its proper divisors (2927760571).

243004120421 is an equidigital number, since it uses as much as digits as its factorization.

243004120421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2927760570.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 243004120421 its reverse (124021400342), we get a palindrome (367025520763).

The spelling of 243004120421 in words is "two hundred forty-three billion, four million, one hundred twenty thousand, four hundred twenty-one".