243040411421 has 4 divisors (see below), whose sum is σ = 243436889052. Its totient is φ = 242643933792.

The previous prime is 243040411391. The next prime is 243040411423. The reversal of 243040411421 is 124114040342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124114040342 = 2 ⋅62057020171.

It can be written as a sum of positive squares in 2 ways, for example, as 87004351225 + 156036060196 = 294965^2 + 395014^2 .

It is a cyclic number.

It is not a de Polignac number, because 243040411421 - 2²² = 243036217117 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 (243040411423) 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, 198237896 + ... + 198239121.

It is an arithmetic number, because the mean of its divisors is an integer number (60859222263).

Almost surely, 2^243040411421 is an apocalyptic number.

It is an amenable number.

243040411421 is a deficient number, since it is larger than the sum of its proper divisors (396477631).

243040411421 is an equidigital number, since it uses as much as digits as its factorization.

243040411421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396477630.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 243040411421 its reverse (124114040342), we get a palindrome (367154451763).

The spelling of 243040411421 in words is "two hundred forty-three billion, forty million, four hundred eleven thousand, four hundred twenty-one".