6521209228 has 48 divisors (see below), whose sum is σ = 12414689280. Its totient is φ = 2988216000.

The previous prime is 6521209193. The next prime is 6521209229. The reversal of 6521209228 is 8229021256.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (6521209229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 276733 + ... + 299371.

It is an arithmetic number, because the mean of its divisors is an integer number (258639360).

Almost surely, 2^6521209228 is an apocalyptic number.

It is an amenable number.

6521209228 is a deficient number, since it is larger than the sum of its proper divisors (5893480052).

6521209228 is a wasteful number, since it uses less digits than its factorization.

6521209228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22798 (or 22796 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 6521209228 is about 80754.0044084502. The cubic root of 6521209228 is about 1868.2832125955.

The spelling of 6521209228 in words is "six billion, five hundred twenty-one million, two hundred nine thousand, two hundred twenty-eight".