55634221 has 2 divisors, whose sum is σ = 55634222. Its totient is φ = 55634220.

The previous prime is 55634219. The next prime is 55634237. The reversal of 55634221 is 12243655.

55634221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54612100 + 1022121 = 7390^2 + 1011^2 .

It is a cyclic number.

It is not a de Polignac number, because 55634221 - 2¹ = 55634219 is a prime.

Together with 55634219, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 55634221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55634291) 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, 27817110 + 27817111.

It is an arithmetic number, because the mean of its divisors is an integer number (27817111).

Almost surely, 2^55634221 is an apocalyptic number.

It is an amenable number.

55634221 is a deficient number, since it is larger than the sum of its proper divisors (1).

55634221 is an equidigital number, since it uses as much as digits as its factorization.

55634221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 28.

The square root of 55634221 is about 7458.8350967158. The cubic root of 55634221 is about 381.7514281552.

Adding to 55634221 its reverse (12243655), we get a palindrome (67877876).

It can be divided in two parts, 55634 and 221, that added together give a palindrome (55855).

The spelling of 55634221 in words is "fifty-five million, six hundred thirty-four thousand, two hundred twenty-one".