6421204404351 has 12 divisors (see below), whose sum is σ = 10118261485800. Its totient is φ = 3891639032880.

The previous prime is 6421204404343. The next prime is 6421204404361. The reversal of 6421204404351 is 1534044021246.

6421204404351 is a `hidden beast` number, since 6 + 4 + 2 + 120 + 440 + 43 + 51 = 666.

It is not a de Polignac number, because 6421204404351 - 2³ = 6421204404343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421204404361) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32430325176 + ... + 32430325373.

It is an arithmetic number, because the mean of its divisors is an integer number (843188457150).

Almost surely, 2^{6421204404351} is an apocalyptic number.

6421204404351 is a deficient number, since it is larger than the sum of its proper divisors (3697057081449).

6421204404351 is a wasteful number, since it uses less digits than its factorization.

6421204404351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64860650566 (or 64860650563 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 36.

Adding to 6421204404351 its reverse (1534044021246), we get a palindrome (7955248425597).

The spelling of 6421204404351 in words is "six trillion, four hundred twenty-one billion, two hundred four million, four hundred four thousand, three hundred fifty-one".