321404431240421 has 4 divisors (see below), whose sum is σ = 321404565449292. Its totient is φ = 321404297031552.

The previous prime is 321404431240331. The next prime is 321404431240447. The reversal of 321404431240421 is 124042134404123.

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 183563071617025 + 137841359623396 = 13548545^2 + 11740586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321404431240421 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 (321404431540421) 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, 63445730 + ... + 68324003.

It is an arithmetic number, because the mean of its divisors is an integer number (80351141362323).

Almost surely, 2^{321404431240421} is an apocalyptic number.

It is an amenable number.

321404431240421 is a deficient number, since it is larger than the sum of its proper divisors (134208871).

321404431240421 is a wasteful number, since it uses less digits than its factorization.

321404431240421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134208870.

The product of its (nonzero) digits is 73728, while the sum is 35.

Adding to 321404431240421 its reverse (124042134404123), we get a palindrome (445446565644544).

The spelling of 321404431240421 in words is "three hundred twenty-one trillion, four hundred four billion, four hundred thirty-one million, two hundred forty thousand, four hundred twenty-one".