6421684273 has 2 divisors, whose sum is σ = 6421684274. Its totient is φ = 6421684272.

The previous prime is 6421684253. The next prime is 6421684301. The reversal of 6421684273 is 3724861246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5194373184 + 1227311089 = 72072^2 + 35033^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6421684273 is a prime.

It is not a weakly prime, because it can be changed into another prime (6421684253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3210842136 + 3210842137.

It is an arithmetic number, because the mean of its divisors is an integer number (3210842137).

Almost surely, 2^6421684273 is an apocalyptic number.

It is an amenable number.

6421684273 is a deficient number, since it is larger than the sum of its proper divisors (1).

6421684273 is an equidigital number, since it uses as much as digits as its factorization.

6421684273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 43.

The square root of 6421684273 is about 80135.4121035139. The cubic root of 6421684273 is about 1858.7300338716.

The spelling of 6421684273 in words is "six billion, four hundred twenty-one million, six hundred eighty-four thousand, two hundred seventy-three".