5521221256 has 8 divisors (see below), whose sum is σ = 10352289870. Its totient is φ = 2760610624.

The previous prime is 5521221247. The next prime is 5521221259. The reversal of 5521221256 is 6521221255.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 4560841156 + 960380100 = 67534^2 + 30990^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (5521221259) 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 as a sum of consecutive naturals, namely, 345076321 + ... + 345076336.

Almost surely, 2^5521221256 is an apocalyptic number.

It is an amenable number.

5521221256 is a deficient number, since it is larger than the sum of its proper divisors (4831068614).

5521221256 is a wasteful number, since it uses less digits than its factorization.

5521221256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690152663 (or 690152659 counting only the distinct ones).

The product of its digits is 12000, while the sum is 31.

The square root of 5521221256 is about 74304.9208060947. The cubic root of 5521221256 is about 1767.4415093742.

Subtracting 5521221256 from its reverse (6521221255), we obtain a palindrome (999999999).

The spelling of 5521221256 in words is "five billion, five hundred twenty-one million, two hundred twenty-one thousand, two hundred fifty-six".