220055021 has 8 divisors (see below), whose sum is σ = 239297400. Its totient is φ = 201512448.

The previous prime is 220055009. The next prime is 220055039. The reversal of 220055021 is 120550022.

It can be written as a sum of positive squares in 4 ways, for example, as 130279396 + 89775625 = 11414^2 + 9475^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220055021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220055041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174296 + ... + 175553.

It is an arithmetic number, because the mean of its divisors is an integer number (29912175).

Almost surely, 2^220055021 is an apocalyptic number.

It is an amenable number.

220055021 is a deficient number, since it is larger than the sum of its proper divisors (19242379).

220055021 is a wasteful number, since it uses less digits than its factorization.

220055021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349903.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 220055021 is about 14834.2516157708. The cubic root of 220055021 is about 603.7313954491.

The spelling of 220055021 in words is "two hundred twenty million, fifty-five thousand, twenty-one".