6421347923 has 2 divisors, whose sum is σ = 6421347924. Its totient is φ = 6421347922.

The previous prime is 6421347883. The next prime is 6421347949. The reversal of 6421347923 is 3297431246.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6421347923 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (6421347973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3210673961 + 3210673962.

It is an arithmetic number, because the mean of its divisors is an integer number (3210673962).

Almost surely, 2^6421347923 is an apocalyptic number.

6421347923 is a deficient number, since it is larger than the sum of its proper divisors (1).

6421347923 is an equidigital number, since it uses as much as digits as its factorization.

6421347923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 41.

The square root of 6421347923 is about 80133.3134407907. The cubic root of 6421347923 is about 1858.6975815981.

The spelling of 6421347923 in words is "six billion, four hundred twenty-one million, three hundred forty-seven thousand, nine hundred twenty-three".