6499201221 has 12 divisors (see below), whose sum is σ = 9394590348. Its totient is φ = 4329636864.

The previous prime is 6499201217. The next prime is 6499201277. The reversal of 6499201221 is 1221029946.

6499201221 is a `hidden beast` number, since 649 + 9 + 2 + 0 + 1 + 2 + 2 + 1 = 666.

6499201221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 5701760100 + 797441121 = 75510^2 + 28239^2 .

It is not a de Polignac number, because 6499201221 - 2² = 6499201217 is a prime.

It is a super-2 number, since 2×6499201221² = 84479233022095781682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6499201211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 250620 + ... + 275333.

It is an arithmetic number, because the mean of its divisors is an integer number (782882529).

Almost surely, 2^6499201221 is an apocalyptic number.

It is an amenable number.

6499201221 is a deficient number, since it is larger than the sum of its proper divisors (2895389127).

6499201221 is a wasteful number, since it uses less digits than its factorization.

6499201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527332 (or 527329 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 6499201221 is about 80617.6235137206. The cubic root of 6499201221 is about 1866.1791278018.

The spelling of 6499201221 in words is "six billion, four hundred ninety-nine million, two hundred one thousand, two hundred twenty-one".