243121245205 has 32 divisors (see below), whose sum is σ = 300830406624. Its totient is φ = 188483936256.

The previous prime is 243121245181. The next prime is 243121245233. The reversal of 243121245205 is 502542121342.

It is a happy number.

243121245205 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 16 ways, for example, as 55308221329 + 187813023876 = 235177^2 + 433374^2 .

It is a cyclic number.

It is not a de Polignac number, because 243121245205 - 2¹³ = 243121237013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65759917 + ... + 65763613.

It is an arithmetic number, because the mean of its divisors is an integer number (9400950207).

Almost surely, 2^243121245205 is an apocalyptic number.

It is an amenable number.

243121245205 is a deficient number, since it is larger than the sum of its proper divisors (57709161419).

243121245205 is a wasteful number, since it uses less digits than its factorization.

243121245205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5065.

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 243121245205 its reverse (502542121342), we get a palindrome (745663366547).

The spelling of 243121245205 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-five thousand, two hundred five".