321440204004021 has 12 divisors (see below), whose sum is σ = 465978699269772. Its totient is φ = 213519846701376.

The previous prime is 321440204003983. The next prime is 321440204004121. The reversal of 321440204004021 is 120400402044123.

321440204004021 is a `hidden beast` number, since 3 + 2 + 14 + 40 + 204 + 0 + 0 + 402 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 55556361660996 + 265883842343025 = 7453614^2 + 16305945^2 .

It is not a de Polignac number, because 321440204004021 - 2⁶ = 321440204003957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321440204004121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64468550256 + ... + 64468555241.

It is an arithmetic number, because the mean of its divisors is an integer number (38831558272481).

Almost surely, 2^{321440204004021} is an apocalyptic number.

It is an amenable number.

321440204004021 is a deficient number, since it is larger than the sum of its proper divisors (144538495265751).

321440204004021 is a wasteful number, since it uses less digits than its factorization.

321440204004021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128937105780 (or 128937105777 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 321440204004021 its reverse (120400402044123), we get a palindrome (441840606048144).

The spelling of 321440204004021 in words is "three hundred twenty-one trillion, four hundred forty billion, two hundred four million, four thousand, twenty-one".