55021163 has 4 divisors (see below), whose sum is σ = 58257720. Its totient is φ = 51784608.

The previous prime is 55021159. The next prime is 55021171. The reversal of 55021163 is 36112055.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55021163 - 2² = 55021159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55021103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1618253 + ... + 1618286.

It is an arithmetic number, because the mean of its divisors is an integer number (14564430).

Almost surely, 2^55021163 is an apocalyptic number.

55021163 is a deficient number, since it is larger than the sum of its proper divisors (3236557).

55021163 is a wasteful number, since it uses less digits than its factorization.

55021163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3236556.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 55021163 is about 7417.6251590384. The cubic root of 55021163 is about 380.3440167201.

The spelling of 55021163 in words is "fifty-five million, twenty-one thousand, one hundred sixty-three".