243322320421 has 4 divisors (see below), whose sum is σ = 243325897344. Its totient is φ = 243318743500.

The previous prime is 243322320419. The next prime is 243322320443. The reversal of 243322320421 is 124023223342.

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 243322320421 - 2¹ = 243322320419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243322320421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243322320481) 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, 1684405 + ... + 1823146.

It is an arithmetic number, because the mean of its divisors is an integer number (60831474336).

Almost surely, 2^243322320421 is an apocalyptic number.

It is an amenable number.

243322320421 is a deficient number, since it is larger than the sum of its proper divisors (3576923).

243322320421 is an equidigital number, since it uses as much as digits as its factorization.

243322320421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3576922.

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 243322320421 its reverse (124023223342), we get a palindrome (367345543763).

The spelling of 243322320421 in words is "two hundred forty-three billion, three hundred twenty-two million, three hundred twenty thousand, four hundred twenty-one".