243235405321 has 4 divisors (see below), whose sum is σ = 247222871044. Its totient is φ = 239247939600.

The previous prime is 243235405213. The next prime is 243235405393. The reversal of 243235405321 is 123504532342.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24889479696 + 218345925625 = 157764^2 + 467275^2 .

It is a cyclic number.

It is not a de Polignac number, because 243235405321 - 2²³ = 243227016713 is a prime.

It is a super-2 number, since 2×243235405321² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243235405421) 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, 1993732770 + ... + 1993732891.

It is an arithmetic number, because the mean of its divisors is an integer number (61805717761).

Almost surely, 2^243235405321 is an apocalyptic number.

It is an amenable number.

243235405321 is a deficient number, since it is larger than the sum of its proper divisors (3987465723).

243235405321 is an equidigital number, since it uses as much as digits as its factorization.

243235405321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3987465722.

The product of its (nonzero) digits is 86400, while the sum is 34.

Adding to 243235405321 its reverse (123504532342), we get a palindrome (366739937663).

The spelling of 243235405321 in words is "two hundred forty-three billion, two hundred thirty-five million, four hundred five thousand, three hundred twenty-one".