321224550545 has 4 divisors (see below), whose sum is σ = 385469460660. Its totient is φ = 256979640432.

The previous prime is 321224550511. The next prime is 321224550667. The reversal of 321224550545 is 545055422123.

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

It can be written as a sum of positive squares in 2 ways, for example, as 172198441024 + 149026109521 = 414968^2 + 386039^2 .

It is a cyclic number.

It is not a de Polignac number, because 321224550545 - 2¹⁶ = 321224485009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 321224550499 and 321224550508.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32122455050 + ... + 32122455059.

It is an arithmetic number, because the mean of its divisors is an integer number (96367365165).

Almost surely, 2^321224550545 is an apocalyptic number.

It is an amenable number.

321224550545 is a deficient number, since it is larger than the sum of its proper divisors (64244910115).

321224550545 is an equidigital number, since it uses as much as digits as its factorization.

321224550545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64244910114.

The product of its (nonzero) digits is 240000, while the sum is 38.

Adding to 321224550545 its reverse (545055422123), we get a palindrome (866279972668).

The spelling of 321224550545 in words is "three hundred twenty-one billion, two hundred twenty-four million, five hundred fifty thousand, five hundred forty-five".