321404224020421 has 4 divisors (see below), whose sum is σ = 322501166764812. Its totient is φ = 320307281276032.

The previous prime is 321404224020409. The next prime is 321404224020491. The reversal of 321404224020421 is 124020422404123.

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 128075054850625 + 193329169169796 = 11317025^2 + 13904286^2 .

It is a cyclic number.

It is not a de Polignac number, because 321404224020421 - 2⁹ = 321404224019909 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 (321404224020491) 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, 548471371756 + ... + 548471372341.

It is an arithmetic number, because the mean of its divisors is an integer number (80625291691203).

Almost surely, 2^{321404224020421} is an apocalyptic number.

It is an amenable number.

321404224020421 is a deficient number, since it is larger than the sum of its proper divisors (1096942744391).

321404224020421 is a wasteful number, since it uses less digits than its factorization.

321404224020421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1096942744390.

The product of its (nonzero) digits is 24576, while the sum is 31.

Adding to 321404224020421 its reverse (124020422404123), we get a palindrome (445424646424544).

The spelling of 321404224020421 in words is "three hundred twenty-one trillion, four hundred four billion, two hundred twenty-four million, twenty thousand, four hundred twenty-one".