6421447329 has 8 divisors (see below), whose sum is σ = 9340287072. Its totient is φ = 3891786240.

The previous prime is 6421447321. The next prime is 6421447337. The reversal of 6421447329 is 9237441246.

It is an interprime number because it is at equal distance from previous prime (6421447321) and next prime (6421447337).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6421447329 - 2³ = 6421447321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6421447321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97294624 + ... + 97294689.

It is an arithmetic number, because the mean of its divisors is an integer number (1167535884).

Almost surely, 2^6421447329 is an apocalyptic number.

It is an amenable number.

6421447329 is a deficient number, since it is larger than the sum of its proper divisors (2918839743).

6421447329 is a wasteful number, since it uses less digits than its factorization.

6421447329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194589327.

The product of its digits is 290304, while the sum is 42.

The square root of 6421447329 is about 80133.9336922879. The cubic root of 6421447329 is about 1858.7071727691.

The spelling of 6421447329 in words is "six billion, four hundred twenty-one million, four hundred forty-seven thousand, three hundred twenty-nine".