321533031697 has 4 divisors (see below), whose sum is σ = 321930477540. Its totient is φ = 321135585856.

The previous prime is 321533031689. The next prime is 321533031707. The reversal of 321533031697 is 796130335123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 796130335123 = 16033 ⋅49655731.

It can be written as a sum of positive squares in 2 ways, for example, as 148064113681 + 173468918016 = 384791^2 + 416496^2 .

It is a cyclic number.

It is not a de Polignac number, because 321533031697 - 2³ = 321533031689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321533011697) 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, 198721708 + ... + 198723325.

It is an arithmetic number, because the mean of its divisors is an integer number (80482619385).

Almost surely, 2^321533031697 is an apocalyptic number.

It is an amenable number.

321533031697 is a deficient number, since it is larger than the sum of its proper divisors (397445843).

321533031697 is an equidigital number, since it uses as much as digits as its factorization.

321533031697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397445842.

The product of its (nonzero) digits is 306180, while the sum is 43.

The spelling of 321533031697 in words is "three hundred twenty-one billion, five hundred thirty-three million, thirty-one thousand, six hundred ninety-seven".