243220100 has 36 divisors (see below), whose sum is σ = 545993700. Its totient is φ = 93932160.

The previous prime is 243220099. The next prime is 243220189. The reversal of 243220100 is 1022342.

It can be written as a sum of positive squares in 6 ways, for example, as 27541504 + 215678596 = 5248^2 + 14686^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39035 + ... + 44834.

Almost surely, 2^243220100 is an apocalyptic number.

243220100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243220100 is an abundant number, since it is smaller than the sum of its proper divisors (302773600).

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

243220100 is a wasteful number, since it uses less digits than its factorization.

243220100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83912 (or 83905 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 243220100 is about 15595.5153810318. The cubic root of 243220100 is about 624.2134960068.

Adding to 243220100 its reverse (1022342), we get a palindrome (244242442).

The spelling of 243220100 in words is "two hundred forty-three million, two hundred twenty thousand, one hundred".