5535521221 has 2 divisors, whose sum is σ = 5535521222. Its totient is φ = 5535521220.

The previous prime is 5535521207. The next prime is 5535521267. The reversal of 5535521221 is 1221255355.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4370664321 + 1164856900 = 66111^2 + 34130^2 .

It is a cyclic number.

It is not a de Polignac number, because 5535521221 - 2⁷ = 5535521093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5535522221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2767760610 + 2767760611.

It is an arithmetic number, because the mean of its divisors is an integer number (2767760611).

Almost surely, 2^5535521221 is an apocalyptic number.

It is an amenable number.

5535521221 is a deficient number, since it is larger than the sum of its proper divisors (1).

5535521221 is an equidigital number, since it uses as much as digits as its factorization.

5535521221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15000, while the sum is 31.

The square root of 5535521221 is about 74401.0834665733. The cubic root of 5535521221 is about 1768.9660852909.

Adding to 5535521221 its reverse (1221255355), we get a palindrome (6756776576).

The spelling of 5535521221 in words is "five billion, five hundred thirty-five million, five hundred twenty-one thousand, two hundred twenty-one".