5551356221 has 16 divisors (see below), whose sum is σ = 5709470400. Its totient is φ = 5395724928.

The previous prime is 5551356211. The next prime is 5551356227. The reversal of 5551356221 is 1226531555.

It is a cyclic number.

It is not a de Polignac number, because 5551356221 - 2¹⁴ = 5551339837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5551356227) 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 15 ways as a sum of consecutive naturals, for example, 4942766 + ... + 4943888.

It is an arithmetic number, because the mean of its divisors is an integer number (356841900).

Almost surely, 2^5551356221 is an apocalyptic number.

It is an amenable number.

5551356221 is a deficient number, since it is larger than the sum of its proper divisors (158114179).

5551356221 is a wasteful number, since it uses less digits than its factorization.

5551356221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2108.

The product of its digits is 45000, while the sum is 35.

The square root of 5551356221 is about 74507.4239321157. The cubic root of 5551356221 is about 1770.6512569359.

Adding to 5551356221 its reverse (1226531555), we get a palindrome (6777887776).

The spelling of 5551356221 in words is "five billion, five hundred fifty-one million, three hundred fifty-six thousand, two hundred twenty-one".