243424131421 has 4 divisors (see below), whose sum is σ = 243545179744. Its totient is φ = 243303083100.

The previous prime is 243424131409. The next prime is 243424131437. The reversal of 243424131421 is 124131424342.

It is a happy number.

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 not a de Polignac number, because 243424131421 - 2¹⁵ = 243424098653 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 (243424131221) 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, 60521145 + ... + 60525166.

It is an arithmetic number, because the mean of its divisors is an integer number (60886294936).

Almost surely, 2^243424131421 is an apocalyptic number.

It is an amenable number.

243424131421 is a deficient number, since it is larger than the sum of its proper divisors (121048323).

243424131421 is a wasteful number, since it uses less digits than its factorization.

243424131421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121048322.

The product of its digits is 18432, while the sum is 31.

Adding to 243424131421 its reverse (124131424342), we get a palindrome (367555555763).

The spelling of 243424131421 in words is "two hundred forty-three billion, four hundred twenty-four million, one hundred thirty-one thousand, four hundred twenty-one".