243320355221 has 4 divisors (see below), whose sum is σ = 243322671072. Its totient is φ = 243318039372.

The previous prime is 243320355211. The next prime is 243320355269. The reversal of 243320355221 is 122553023342.

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 243320355221 - 2¹⁰ = 243320354197 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 (243320355211) 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, 992441 + ... + 1213086.

It is an arithmetic number, because the mean of its divisors is an integer number (60830667768).

Almost surely, 2^243320355221 is an apocalyptic number.

It is an amenable number.

243320355221 is a deficient number, since it is larger than the sum of its proper divisors (2315851).

243320355221 is a wasteful number, since it uses less digits than its factorization.

243320355221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2315850.

The product of its (nonzero) digits is 43200, while the sum is 32.

Adding to 243320355221 its reverse (122553023342), we get a palindrome (365873378563).

The spelling of 243320355221 in words is "two hundred forty-three billion, three hundred twenty million, three hundred fifty-five thousand, two hundred twenty-one".