243721120 has 48 divisors (see below), whose sum is σ = 576979200. Its totient is φ = 97287424.

The previous prime is 243721103. The next prime is 243721123. The reversal of 243721120 is 21127342.

It is a junction number, because it is equal to n+sod(n) for n = 243721091 and 243721100.

It is not an unprimeable number, because it can be changed into a prime (243721123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94569 + ... + 97111.

It is an arithmetic number, because the mean of its divisors is an integer number (12020400).

Almost surely, 2^243721120 is an apocalyptic number.

243721120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243721120 is an abundant number, since it is smaller than the sum of its proper divisors (333258080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243721120 is a wasteful number, since it uses less digits than its factorization.

243721120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3157 (or 3149 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 243721120 is about 15611.5700683820. The cubic root of 243721120 is about 624.6418171673.

Adding to 243721120 its reverse (21127342), we get a palindrome (264848462).

The spelling of 243721120 in words is "two hundred forty-three million, seven hundred twenty-one thousand, one hundred twenty".