55633434221 has 2 divisors, whose sum is σ = 55633434222. Its totient is φ = 55633434220.

The previous prime is 55633434191. The next prime is 55633434251. The reversal of 55633434221 is 12243433655.

55633434221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (55633434191) and next prime (55633434251).

It can be written as a sum of positive squares in only one way, i.e., 46227150025 + 9406284196 = 215005^2 + 96986^2 .

It is a cyclic number.

It is not a de Polignac number, because 55633434221 - 2¹⁰ = 55633433197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55633434251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27816717110 + 27816717111.

It is an arithmetic number, because the mean of its divisors is an integer number (27816717111).

Almost surely, 2^55633434221 is an apocalyptic number.

It is an amenable number.

55633434221 is a deficient number, since it is larger than the sum of its proper divisors (1).

55633434221 is an equidigital number, since it uses as much as digits as its factorization.

55633434221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 259200, while the sum is 38.

Adding to 55633434221 its reverse (12243433655), we get a palindrome (67876867876).

It can be divided in two parts, 55633434 and 221, that added together give a palindrome (55633655).

The spelling of 55633434221 in words is "fifty-five billion, six hundred thirty-three million, four hundred thirty-four thousand, two hundred twenty-one".