243352203421 has 4 divisors (see below), whose sum is σ = 243458149212. Its totient is φ = 243246257632.

The previous prime is 243352203401. The next prime is 243352203427. The reversal of 243352203421 is 124302253342.

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 86151055225 + 157201148196 = 293515^2 + 396486^2 .

It is a cyclic number.

It is not a de Polignac number, because 243352203421 - 2⁷ = 243352203293 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 (243352203427) 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, 52969450 + ... + 52974043.

It is an arithmetic number, because the mean of its divisors is an integer number (60864537303).

Almost surely, 2^243352203421 is an apocalyptic number.

It is an amenable number.

243352203421 is a deficient number, since it is larger than the sum of its proper divisors (105945791).

243352203421 is a wasteful number, since it uses less digits than its factorization.

243352203421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105945790.

The product of its (nonzero) digits is 34560, while the sum is 31.

Adding to 243352203421 its reverse (124302253342), we get a palindrome (367654456763).

The spelling of 243352203421 in words is "two hundred forty-three billion, three hundred fifty-two million, two hundred three thousand, four hundred twenty-one".