321140345431 has 4 divisors (see below), whose sum is σ = 321142261672. Its totient is φ = 321138429192.

The previous prime is 321140345419. The next prime is 321140345459. The reversal of 321140345431 is 134543041123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134543041123 = 3299 ⋅40782977.

It is a cyclic number.

It is not a de Polignac number, because 321140345431 - 2⁹ = 321140344919 is a prime.

It is a super-2 number, since 2×321140345431² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321140345393 and 321140345402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321140342431) 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, 679785 + ... + 1050898.

It is an arithmetic number, because the mean of its divisors is an integer number (80285565418).

Almost surely, 2^321140345431 is an apocalyptic number.

321140345431 is a deficient number, since it is larger than the sum of its proper divisors (1916241).

321140345431 is a wasteful number, since it uses less digits than its factorization.

321140345431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1916240.

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 321140345431 its reverse (134543041123), we get a palindrome (455683386554).

The spelling of 321140345431 in words is "three hundred twenty-one billion, one hundred forty million, three hundred forty-five thousand, four hundred thirty-one".