243315520221 has 16 divisors (see below), whose sum is σ = 326803083264. Its totient is φ = 161021770224.

The previous prime is 243315520193. The next prime is 243315520303. The reversal of 243315520221 is 122025513342.

It is not a de Polignac number, because 243315520221 - 2¹⁹ = 243314995933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243315525221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45420 + ... + 699066.

It is an arithmetic number, because the mean of its divisors is an integer number (20425192704).

Almost surely, 2^243315520221 is an apocalyptic number.

It is an amenable number.

243315520221 is a deficient number, since it is larger than the sum of its proper divisors (83487563043).

243315520221 is a wasteful number, since it uses less digits than its factorization.

243315520221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654560.

The product of its (nonzero) digits is 14400, while the sum is 30.

The spelling of 243315520221 in words is "two hundred forty-three billion, three hundred fifteen million, five hundred twenty thousand, two hundred twenty-one".