321241021 has 4 divisors (see below), whose sum is σ = 321657372. Its totient is φ = 320824672.

The previous prime is 321241013. The next prime is 321241043. The reversal of 321241021 is 120142123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120142123 = 61 ⋅1969543.

It can be written as a sum of positive squares in 2 ways, for example, as 187005625 + 134235396 = 13675^2 + 11586^2 .

It is a cyclic number.

It is not a de Polignac number, because 321241021 - 2³ = 321241013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321240986 and 321241004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321241121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207016 + ... + 208561.

It is an arithmetic number, because the mean of its divisors is an integer number (80414343).

Almost surely, 2^321241021 is an apocalyptic number.

It is an amenable number.

321241021 is a deficient number, since it is larger than the sum of its proper divisors (416351).

321241021 is an equidigital number, since it uses as much as digits as its factorization.

321241021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416350.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 321241021 is about 17923.1978452507. The cubic root of 321241021 is about 684.8734531003.

Adding to 321241021 its reverse (120142123), we get a palindrome (441383144).

The spelling of 321241021 in words is "three hundred twenty-one million, two hundred forty-one thousand, twenty-one".