243143043021 has 6 divisors (see below), whose sum is σ = 351206617710. Its totient is φ = 162095362008.

The previous prime is 243143043001. The next prime is 243143043047. The reversal of 243143043021 is 120340341342.

243143043021 is a `hidden beast` number, since 2 + 43 + 14 + 304 + 302 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 180167140521 + 62975902500 = 424461^2 + 250950^2 .

It is not a de Polignac number, because 243143043021 - 2⁶ = 243143042957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243143043001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13507946826 + ... + 13507946843.

It is an arithmetic number, because the mean of its divisors is an integer number (58534436285).

Almost surely, 2^243143043021 is an apocalyptic number.

It is an amenable number.

243143043021 is a deficient number, since it is larger than the sum of its proper divisors (108063574689).

243143043021 is a wasteful number, since it uses less digits than its factorization.

243143043021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27015893675 (or 27015893672 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 243143043021 its reverse (120340341342), we get a palindrome (363483384363).

The spelling of 243143043021 in words is "two hundred forty-three billion, one hundred forty-three million, forty-three thousand, twenty-one".