6421071571 has 4 divisors (see below), whose sum is σ = 6628202944. Its totient is φ = 6213940200.

The previous prime is 6421071557. The next prime is 6421071583. The reversal of 6421071571 is 1751701246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1751701246 = 2 ⋅875850623.

It is a cyclic number.

It is not a de Polignac number, because 6421071571 - 2⁷ = 6421071443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6421071271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103565640 + ... + 103565701.

It is an arithmetic number, because the mean of its divisors is an integer number (1657050736).

Almost surely, 2^6421071571 is an apocalyptic number.

6421071571 is a deficient number, since it is larger than the sum of its proper divisors (207131373).

6421071571 is a wasteful number, since it uses less digits than its factorization.

6421071571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207131372.

The product of its (nonzero) digits is 11760, while the sum is 34.

The square root of 6421071571 is about 80131.5890956869. The cubic root of 6421071571 is about 1858.6709173022.

The spelling of 6421071571 in words is "six billion, four hundred twenty-one million, seventy-one thousand, five hundred seventy-one".