243421516 has 18 divisors (see below), whose sum is σ = 461277852. Its totient is φ = 112348080.

The previous prime is 243421511. The next prime is 243421531. The reversal of 243421516 is 615124342.

It is not an unprimeable number, because it can be changed into a prime (243421511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 179370 + ... + 180721.

Almost surely, 2^243421516 is an apocalyptic number.

243421516 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

243421516 is a deficient number, since it is larger than the sum of its proper divisors (217856336).

243421516 is a wasteful number, since it uses less digits than its factorization.

243421516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360121 (or 360106 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 243421516 is about 15601.9715420840. The cubic root of 243421516 is about 624.3857568463.

Adding to 243421516 its reverse (615124342), we get a palindrome (858545858).

The spelling of 243421516 in words is "two hundred forty-three million, four hundred twenty-one thousand, five hundred sixteen".