321130021 has 8 divisors (see below), whose sum is σ = 338473080. Its totient is φ = 304204992.

The previous prime is 321129997. The next prime is 321130027. The reversal of 321130021 is 120031123.

It can be written as a sum of positive squares in 4 ways, for example, as 30802500 + 290327521 = 5550^2 + 17039^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 321130021 - 2⁵ = 321129989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321129983 and 321130010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321130027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102930 + ... + 106003.

It is an arithmetic number, because the mean of its divisors is an integer number (42309135).

Almost surely, 2^321130021 is an apocalyptic number.

It is an amenable number.

321130021 is a deficient number, since it is larger than the sum of its proper divisors (17343059).

321130021 is a wasteful number, since it uses less digits than its factorization.

321130021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209015.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 321130021 is about 17920.1010320813. The cubic root of 321130021 is about 684.7945614417.

Adding to 321130021 its reverse (120031123), we get a palindrome (441161144).

The spelling of 321130021 in words is "three hundred twenty-one million, one hundred thirty thousand, twenty-one".