6533271721 has 8 divisors (see below), whose sum is σ = 6670490400. Its totient is φ = 6396936000.

The previous prime is 6533271697. The next prime is 6533271743. The reversal of 6533271721 is 1271723356.

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

It is a cyclic number.

It is not a de Polignac number, because 6533271721 - 2²¹ = 6531174569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6533271761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205776 + ... + 235393.

It is an arithmetic number, because the mean of its divisors is an integer number (833811300).

Almost surely, 2^6533271721 is an apocalyptic number.

It is an amenable number.

6533271721 is a deficient number, since it is larger than the sum of its proper divisors (137218679).

6533271721 is a wasteful number, since it uses less digits than its factorization.

6533271721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441479.

The product of its digits is 52920, while the sum is 37.

The square root of 6533271721 is about 80828.6565581787. The cubic root of 6533271721 is about 1869.4344444894.

The spelling of 6533271721 in words is "six billion, five hundred thirty-three million, two hundred seventy-one thousand, seven hundred twenty-one".