243305452221 has 32 divisors (see below), whose sum is σ = 359973280128. Its totient is φ = 145204980480.

The previous prime is 243305452213. The next prime is 243305452267. The reversal of 243305452221 is 122254503342.

It is not a de Polignac number, because 243305452221 - 2³ = 243305452213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243305452211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 168391 + ... + 717611.

It is an arithmetic number, because the mean of its divisors is an integer number (11249165004).

Almost surely, 2^243305452221 is an apocalyptic number.

It is an amenable number.

243305452221 is a deficient number, since it is larger than the sum of its proper divisors (116667827907).

243305452221 is a wasteful number, since it uses less digits than its factorization.

243305452221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549581.

The product of its (nonzero) digits is 57600, while the sum is 33.

Adding to 243305452221 its reverse (122254503342), we get a palindrome (365559955563).

The spelling of 243305452221 in words is "two hundred forty-three billion, three hundred five million, four hundred fifty-two thousand, two hundred twenty-one".