321420443243 has 4 divisors (see below), whose sum is σ = 321430120440. Its totient is φ = 321410766048.

The previous prime is 321420443231. The next prime is 321420443261. The reversal of 321420443243 is 342344024123.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 321420443243 - 2¹⁰ = 321420442219 is a prime.

It is a super-2 number, since 2×321420443243² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321420443143) 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, 4788605 + ... + 4855262.

It is an arithmetic number, because the mean of its divisors is an integer number (80357530110).

Almost surely, 2^321420443243 is an apocalyptic number.

321420443243 is a deficient number, since it is larger than the sum of its proper divisors (9677197).

321420443243 is an equidigital number, since it uses as much as digits as its factorization.

321420443243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9677196.

The product of its (nonzero) digits is 55296, while the sum is 32.

Adding to 321420443243 its reverse (342344024123), we get a palindrome (663764467366).

The spelling of 321420443243 in words is "three hundred twenty-one billion, four hundred twenty million, four hundred forty-three thousand, two hundred forty-three".