6553233221 has 2 divisors, whose sum is σ = 6553233222. Its totient is φ = 6553233220.

The previous prime is 6553233187. The next prime is 6553233227. The reversal of 6553233221 is 1223323556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6549664900 + 3568321 = 80930^2 + 1889^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6553233221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6553233227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3276616610 + 3276616611.

It is an arithmetic number, because the mean of its divisors is an integer number (3276616611).

Almost surely, 2^6553233221 is an apocalyptic number.

It is an amenable number.

6553233221 is a deficient number, since it is larger than the sum of its proper divisors (1).

6553233221 is an equidigital number, since it uses as much as digits as its factorization.

6553233221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 32.

The square root of 6553233221 is about 80952.0427228368. The cubic root of 6553233221 is about 1871.3364407274.

Adding to 6553233221 its reverse (1223323556), we get a palindrome (7776556777).

The spelling of 6553233221 in words is "six billion, five hundred fifty-three million, two hundred thirty-three thousand, two hundred twenty-one".