321030720545 has 16 divisors (see below), whose sum is σ = 414953597952. Its totient is φ = 237733826880.

The previous prime is 321030720503. The next prime is 321030720589. The reversal of 321030720545 is 545027030123.

It is not a de Polignac number, because 321030720545 - 2⁶ = 321030720481 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45021782 + ... + 45028911.

It is an arithmetic number, because the mean of its divisors is an integer number (25934599872).

Almost surely, 2^321030720545 is an apocalyptic number.

It is an amenable number.

321030720545 is a deficient number, since it is larger than the sum of its proper divisors (93922877407).

321030720545 is a wasteful number, since it uses less digits than its factorization.

321030720545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90050752.

The product of its (nonzero) digits is 25200, while the sum is 32.

Adding to 321030720545 its reverse (545027030123), we get a palindrome (866057750668).

The spelling of 321030720545 in words is "three hundred twenty-one billion, thirty million, seven hundred twenty thousand, five hundred forty-five".