243212240221 has 16 divisors (see below), whose sum is σ = 255718080000. Its totient is φ = 230872588848.

The previous prime is 243212240213. The next prime is 243212240263. The reversal of 243212240221 is 122042212342.

It is a cyclic number.

It is not a de Polignac number, because 243212240221 - 2³ = 243212240213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243212240321) 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, 1995190 + ... + 2113576.

It is an arithmetic number, because the mean of its divisors is an integer number (15982380000).

Almost surely, 2^243212240221 is an apocalyptic number.

It is an amenable number.

243212240221 is a deficient number, since it is larger than the sum of its proper divisors (12505839779).

243212240221 is a wasteful number, since it uses less digits than its factorization.

243212240221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119088.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 243212240221 its reverse (122042212342), we get a palindrome (365254452563).

The spelling of 243212240221 in words is "two hundred forty-three billion, two hundred twelve million, two hundred forty thousand, two hundred twenty-one".