55322221 has 4 divisors (see below), whose sum is σ = 55441152. Its totient is φ = 55203292.

The previous prime is 55322213. The next prime is 55322231. The reversal of 55322221 is 12222355.

55322221 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, and also an emirpimes, since its reverse is a distinct semiprime: 12222355 = 5 ⋅2444471.

It is a cyclic number.

It is not a de Polignac number, because 55322221 - 2³ = 55322213 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 55322192 and 55322201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55322231) 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, 58765 + ... + 59698.

It is an arithmetic number, because the mean of its divisors is an integer number (13860288).

Almost surely, 2^55322221 is an apocalyptic number.

It is an amenable number.

55322221 is a deficient number, since it is larger than the sum of its proper divisors (118931).

55322221 is a wasteful number, since it uses less digits than its factorization.

55322221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118930.

The product of its digits is 1200, while the sum is 22.

The square root of 55322221 is about 7437.8908972907. The cubic root of 55322221 is about 381.0364617686.

Adding to 55322221 its reverse (12222355), we get a palindrome (67544576).

The spelling of 55322221 in words is "fifty-five million, three hundred twenty-two thousand, two hundred twenty-one".