243221380668857 has 8 divisors (see below), whose sum is σ = 247346790237600. Its totient is φ = 239096071543104.

The previous prime is 243221380668839. The next prime is 243221380668883. The reversal of 243221380668857 is 758866083122342.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243221380668857 - 2⁸ = 243221380668601 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243221380668793 and 243221380668802.

It is not an unprimeable number, because it can be changed into a prime (243221380668817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20218688 + ... + 29920529.

It is an arithmetic number, because the mean of its divisors is an integer number (30918348779700).

Almost surely, 2^{243221380668857} is an apocalyptic number.

It is an amenable number.

243221380668857 is a deficient number, since it is larger than the sum of its proper divisors (4125409568743).

243221380668857 is an equidigital number, since it uses as much as digits as its factorization.

243221380668857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50221495.

The product of its (nonzero) digits is 185794560, while the sum is 65.

The spelling of 243221380668857 in words is "two hundred forty-three trillion, two hundred twenty-one billion, three hundred eighty million, six hundred sixty-eight thousand, eight hundred fifty-seven".