6421428407 has 2 divisors, whose sum is σ = 6421428408. Its totient is φ = 6421428406.

The previous prime is 6421428401. The next prime is 6421428449. The reversal of 6421428407 is 7048241246.

6421428407 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6421428407 - 2³² = 2126461111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6421428401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3210714203 + 3210714204.

It is an arithmetic number, because the mean of its divisors is an integer number (3210714204).

Almost surely, 2^6421428407 is an apocalyptic number.

6421428407 is a deficient number, since it is larger than the sum of its proper divisors (1).

6421428407 is an equidigital number, since it uses as much as digits as its factorization.

6421428407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86016, while the sum is 38.

The square root of 6421428407 is about 80133.8156273617. The cubic root of 6421428407 is about 1858.7053470908.

The spelling of 6421428407 in words is "six billion, four hundred twenty-one million, four hundred twenty-eight thousand, four hundred seven".