6501109221 has 32 divisors (see below), whose sum is σ = 9821216640. Its totient is φ = 4249065600.

The previous prime is 6501109201. The next prime is 6501109259. The reversal of 6501109221 is 1229011056.

6501109221 is a `hidden beast` number, since 650 + 1 + 1 + 0 + 9 + 2 + 2 + 1 = 666.

It is not a de Polignac number, because 6501109221 - 2⁵ = 6501109189 is a prime.

It is a super-2 number, since 2×6501109221² = 84528842206742453682, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6501109201) 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 31 ways as a sum of consecutive naturals, for example, 509206 + ... + 521816.

It is an arithmetic number, because the mean of its divisors is an integer number (306913020).

Almost surely, 2^6501109221 is an apocalyptic number.

6501109221 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

6501109221 is a deficient number, since it is larger than the sum of its proper divisors (3320107419).

6501109221 is a wasteful number, since it uses less digits than its factorization.

6501109221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12994 (or 12988 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 6501109221 is about 80629.4562861489. The cubic root of 6501109221 is about 1866.3617308259.

The spelling of 6501109221 in words is "six billion, five hundred one million, one hundred nine thousand, two hundred twenty-one".