321020505125 has 16 divisors (see below), whose sum is σ = 424200274992. Its totient is φ = 241709555200.

The previous prime is 321020505109. The next prime is 321020505133. The reversal of 321020505125 is 521505020123.

It can be written as a sum of positive squares in 8 ways, for example, as 4655878756 + 316364626369 = 68234^2 + 562463^2 .

It is not a de Polignac number, because 321020505125 - 2⁴ = 321020505109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321020505094 and 321020505103.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75532112 + ... + 75536361.

It is an arithmetic number, because the mean of its divisors is an integer number (26512517187).

Almost surely, 2^321020505125 is an apocalyptic number.

It is an amenable number.

321020505125 is a deficient number, since it is larger than the sum of its proper divisors (103179769867).

321020505125 is a wasteful number, since it uses less digits than its factorization.

321020505125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151068505 (or 151068495 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

Adding to 321020505125 its reverse (521505020123), we get a palindrome (842525525248).

The spelling of 321020505125 in words is "three hundred twenty-one billion, twenty million, five hundred five thousand, one hundred twenty-five".