321404222431021 has 4 divisors (see below), whose sum is σ = 323561297749500. Its totient is φ = 319247147112544.

The previous prime is 321404222431009. The next prime is 321404222431049. The reversal of 321404222431021 is 120134222404123.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37672466084100 + 283731756346921 = 6137790^2 + 16844339^2 .

It is a cyclic number.

It is not a de Polignac number, because 321404222431021 - 2⁴⁵ = 286219850342189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321404222431321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1078537659016 + ... + 1078537659313.

It is an arithmetic number, because the mean of its divisors is an integer number (80890324437375).

Almost surely, 2^{321404222431021} is an apocalyptic number.

It is an amenable number.

321404222431021 is a deficient number, since it is larger than the sum of its proper divisors (2157075318479).

321404222431021 is a wasteful number, since it uses less digits than its factorization.

321404222431021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2157075318478.

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 321404222431021 its reverse (120134222404123), we get a palindrome (441538444835144).

The spelling of 321404222431021 in words is "three hundred twenty-one trillion, four hundred four billion, two hundred twenty-two million, four hundred thirty-one thousand, twenty-one".