243221113204213 has 4 divisors (see below), whose sum is σ = 243324743847040. Its totient is φ = 243117482561388.

The previous prime is 243221113204211. The next prime is 243221113204229. The reversal of 243221113204213 is 312402311122342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 243221113204213 - 2¹ = 243221113204211 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 (243221113204211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51815317893 + ... + 51815322586.

It is an arithmetic number, because the mean of its divisors is an integer number (60831185961760).

Almost surely, 2^{243221113204213} is an apocalyptic number.

It is an amenable number.

243221113204213 is a deficient number, since it is larger than the sum of its proper divisors (103630642827).

243221113204213 is a wasteful number, since it uses less digits than its factorization.

243221113204213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103630642826.

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 243221113204213 its reverse (312402311122342), we get a palindrome (555623424326555).

The spelling of 243221113204213 in words is "two hundred forty-three trillion, two hundred twenty-one billion, one hundred thirteen million, two hundred four thousand, two hundred thirteen".