321320135 has 4 divisors (see below), whose sum is σ = 385584168. Its totient is φ = 257056104.

The previous prime is 321320113. The next prime is 321320137. The reversal of 321320135 is 531023123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 531023123 = 21269 ⋅24967.

It is a cyclic number.

It is not a de Polignac number, because 321320135 - 2¹⁰ = 321319111 is a prime.

It is a super-4 number, since 4×321320135⁴ (a number of 35 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321320137) 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, 32132009 + ... + 32132018.

It is an arithmetic number, because the mean of its divisors is an integer number (96396042).

Almost surely, 2^321320135 is an apocalyptic number.

321320135 is a deficient number, since it is larger than the sum of its proper divisors (64264033).

321320135 is an equidigital number, since it uses as much as digits as its factorization.

321320135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64264032.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 321320135 is about 17925.4047374111. The cubic root of 321320135 is about 684.9296711500.

Adding to 321320135 its reverse (531023123), we get a palindrome (852343258).

The spelling of 321320135 in words is "three hundred twenty-one million, three hundred twenty thousand, one hundred thirty-five".