6421204404413 has 2 divisors, whose sum is σ = 6421204404414. Its totient is φ = 6421204404412.

The previous prime is 6421204404409. The next prime is 6421204404467. The reversal of 6421204404413 is 3144044021246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3398484876004 + 3022719528409 = 1843498^2 + 1738597^2 .

It is a cyclic number.

It is not a de Polignac number, because 6421204404413 - 2² = 6421204404409 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6421204401413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3210602202206 + 3210602202207.

It is an arithmetic number, because the mean of its divisors is an integer number (3210602202207).

Almost surely, 2^{6421204404413} is an apocalyptic number.

It is an amenable number.

6421204404413 is a deficient number, since it is larger than the sum of its proper divisors (1).

6421204404413 is an equidigital number, since it uses as much as digits as its factorization.

6421204404413 is an evil number, because the sum of its binary digits is even.

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

Adding to 6421204404413 its reverse (3144044021246), we get a palindrome (9565248425659).

The spelling of 6421204404413 in words is "six trillion, four hundred twenty-one billion, two hundred four million, four hundred four thousand, four hundred thirteen".