243235315221 has 16 divisors (see below), whose sum is σ = 335072156160. Its totient is φ = 156786946560.

The previous prime is 243235315207. The next prime is 243235315229. The reversal of 243235315221 is 122513532342.

243235315221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 243235315221 - 2⁷ = 243235315093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243235315229) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1053300 + ... + 1263293.

It is an arithmetic number, because the mean of its divisors is an integer number (20942009760).

Almost surely, 2^243235315221 is an apocalyptic number.

It is an amenable number.

243235315221 is a deficient number, since it is larger than the sum of its proper divisors (91836840939).

243235315221 is a wasteful number, since it uses less digits than its factorization.

243235315221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2317756.

The product of its digits is 43200, while the sum is 33.

Adding to 243235315221 its reverse (122513532342), we get a palindrome (365748847563).

The spelling of 243235315221 in words is "two hundred forty-three billion, two hundred thirty-five million, three hundred fifteen thousand, two hundred twenty-one".