321404212320421 has 4 divisors (see below), whose sum is σ = 338320223495200. Its totient is φ = 304488201145644.

The previous prime is 321404212320419. The next prime is 321404212320437. The reversal of 321404212320421 is 124023212404123.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 321404212320421 - 2¹ = 321404212320419 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 (321404212320491) 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, 8458005587361 + ... + 8458005587398.

It is an arithmetic number, because the mean of its divisors is an integer number (84580055873800).

Almost surely, 2^{321404212320421} is an apocalyptic number.

It is an amenable number.

321404212320421 is a deficient number, since it is larger than the sum of its proper divisors (16916011174779).

321404212320421 is a wasteful number, since it uses less digits than its factorization.

321404212320421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16916011174778.

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

Adding to 321404212320421 its reverse (124023212404123), we get a palindrome (445427424724544).

The spelling of 321404212320421 in words is "three hundred twenty-one trillion, four hundred four billion, two hundred twelve million, three hundred twenty thousand, four hundred twenty-one".