243403421331 has 16 divisors (see below), whose sum is σ = 371259536384. Its totient is φ = 138953012544.

The previous prime is 243403421329. The next prime is 243403421347. The reversal of 243403421331 is 133124304342.

It is a happy number.

It is not a de Polignac number, because 243403421331 - 2¹ = 243403421329 is a prime.

It is a super-2 number, since 2×243403421331² (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 (243403421311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5588491 + ... + 5631876.

It is an arithmetic number, because the mean of its divisors is an integer number (23203721024).

Almost surely, 2^243403421331 is an apocalyptic number.

243403421331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

243403421331 is a deficient number, since it is larger than the sum of its proper divisors (127856115053).

243403421331 is a wasteful number, since it uses less digits than its factorization.

243403421331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11221410.

The product of its (nonzero) digits is 20736, while the sum is 30.

Adding to 243403421331 its reverse (133124304342), we get a palindrome (376527725673).

The spelling of 243403421331 in words is "two hundred forty-three billion, four hundred three million, four hundred twenty-one thousand, three hundred thirty-one".