6505387021 has 8 divisors (see below), whose sum is σ = 7443596160. Its totient is φ = 5569394928.

The previous prime is 6505387001. The next prime is 6505387037. The reversal of 6505387021 is 1207835056.

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 6505387021 - 2¹⁷ = 6505255949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6505387001) 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, 547966 + ... + 559711.

It is an arithmetic number, because the mean of its divisors is an integer number (930449520).

Almost surely, 2^6505387021 is an apocalyptic number.

It is an amenable number.

6505387021 is a deficient number, since it is larger than the sum of its proper divisors (938209139).

6505387021 is a wasteful number, since it uses less digits than its factorization.

6505387021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108523.

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 6505387021 is about 80655.9794497593. The cubic root of 6505387021 is about 1866.7710031214.

The spelling of 6505387021 in words is "six billion, five hundred five million, three hundred eighty-seven thousand, twenty-one".