243215613763221 has 16 divisors (see below), whose sum is σ = 353769178572288. Its totient is φ = 147402980156400.

The previous prime is 243215613763169. The next prime is 243215613763289. The reversal of 243215613763221 is 122367316512342.

It is a happy number.

It is not a de Polignac number, because 243215613763221 - 2⁴³ = 234419520741013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243215613763921) 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, 1345120 + ... + 22096166.

It is an arithmetic number, because the mean of its divisors is an integer number (22110573660768).

Almost surely, 2^{243215613763221} is an apocalyptic number.

It is an amenable number.

243215613763221 is a deficient number, since it is larger than the sum of its proper divisors (110553564809067).

243215613763221 is a wasteful number, since it uses less digits than its factorization.

243215613763221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21106232.

The product of its digits is 2177280, while the sum is 48.

The spelling of 243215613763221 in words is "two hundred forty-three trillion, two hundred fifteen billion, six hundred thirteen million, seven hundred sixty-three thousand, two hundred twenty-one".