220021055 has 16 divisors (see below), whose sum is σ = 287115840. Its totient is φ = 161183232.

The previous prime is 220021049. The next prime is 220021069. The reversal of 220021055 is 550120022.

It is a cyclic number.

It is not a de Polignac number, because 220021055 - 2¹⁴ = 220004671 is a prime.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31835 + ... + 38124.

It is an arithmetic number, because the mean of its divisors is an integer number (17944740).

Almost surely, 2^220021055 is an apocalyptic number.

220021055 is a deficient number, since it is larger than the sum of its proper divisors (67094785).

220021055 is a wasteful number, since it uses less digits than its factorization.

220021055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70018.

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

The square root of 220021055 is about 14833.1067211154. The cubic root of 220021055 is about 603.7003314063.

Adding to 220021055 its reverse (550120022), we get a palindrome (770141077).

The spelling of 220021055 in words is "two hundred twenty million, twenty-one thousand, fifty-five".