321021204421 has 8 divisors (see below), whose sum is σ = 327787730424. Its totient is φ = 314280957120.

The previous prime is 321021204347. The next prime is 321021204431. The reversal of 321021204421 is 124402120123.

It can be written as a sum of positive squares in 4 ways, for example, as 143073062500 + 177948141921 = 378250^2 + 421839^2 .

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 321021204421 - 2⁷ = 321021204293 is a prime.

It is a super-2 number, since 2×321021204421² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321021204392 and 321021204401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321021204431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6544986 + ... + 6593851.

It is an arithmetic number, because the mean of its divisors is an integer number (40973466303).

Almost surely, 2^321021204421 is an apocalyptic number.

It is an amenable number.

321021204421 is a deficient number, since it is larger than the sum of its proper divisors (6766526003).

321021204421 is a wasteful number, since it uses less digits than its factorization.

321021204421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13139351.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 321021204421 its reverse (124402120123), we get a palindrome (445423324544).

The spelling of 321021204421 in words is "three hundred twenty-one billion, twenty-one million, two hundred four thousand, four hundred twenty-one".