55221017 has 8 divisors (see below), whose sum is σ = 57213000. Its totient is φ = 53234944.

The previous prime is 55221007. The next prime is 55221037. The reversal of 55221017 is 71012255.

It is a happy number.

55221017 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 30261001 + 24960016 = 5501^2 + 4996^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55221017 - 2²⁰ = 54172441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55220983 and 55221001.

It is not an unprimeable number, because it can be changed into a prime (55221007) 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 7 ways as a sum of consecutive naturals, for example, 27359 + ... + 29307.

It is an arithmetic number, because the mean of its divisors is an integer number (7151625).

Almost surely, 2^55221017 is an apocalyptic number.

It is an amenable number.

55221017 is a deficient number, since it is larger than the sum of its proper divisors (1991983).

55221017 is a wasteful number, since it uses less digits than its factorization.

55221017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2955.

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 55221017 is about 7431.0845103524. The cubic root of 55221017 is about 380.8039695796.

The spelling of 55221017 in words is "fifty-five million, two hundred twenty-one thousand, seventeen".