55635221 has 4 divisors (see below), whose sum is σ = 55680000. Its totient is φ = 55590444.

The previous prime is 55635199. The next prime is 55635247. The reversal of 55635221 is 12253655.

It is a happy number.

55635221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55635221 - 2⁶ = 55635157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55635121) 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 in 3 ways as a sum of consecutive naturals, for example, 20471 + ... + 23028.

It is an arithmetic number, because the mean of its divisors is an integer number (13920000).

Almost surely, 2^55635221 is an apocalyptic number.

It is an amenable number.

55635221 is a deficient number, since it is larger than the sum of its proper divisors (44779).

55635221 is a wasteful number, since it uses less digits than its factorization.

55635221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44778.

The product of its digits is 9000, while the sum is 29.

The square root of 55635221 is about 7458.9021310110. The cubic root of 55635221 is about 381.7537154113.

Adding to 55635221 its reverse (12253655), we get a palindrome (67888876).

The spelling of 55635221 in words is "fifty-five million, six hundred thirty-five thousand, two hundred twenty-one".