220118821 has 8 divisors (see below), whose sum is σ = 237898584. Its totient is φ = 202460160.

The previous prime is 220118797. The next prime is 220118827. The reversal of 220118821 is 128811022.

It can be written as a sum of positive squares in 4 ways, for example, as 41602500 + 178516321 = 6450^2 + 13361^2 .

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 220118821 - 2¹³ = 220110629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220118827) 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, 26476 + ... + 33781.

It is an arithmetic number, because the mean of its divisors is an integer number (29737323).

Almost surely, 2^220118821 is an apocalyptic number.

It is an amenable number.

220118821 is a deficient number, since it is larger than the sum of its proper divisors (17779763).

220118821 is a wasteful number, since it uses less digits than its factorization.

220118821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60551.

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 220118821 is about 14836.4018885982. The cubic root of 220118821 is about 603.7897359208.

Adding to 220118821 its reverse (128811022), we get a palindrome (348929843).

The spelling of 220118821 in words is "two hundred twenty million, one hundred eighteen thousand, eight hundred twenty-one".