220442021 has 8 divisors (see below), whose sum is σ = 228641400. Its totient is φ = 212282560.

The previous prime is 220442017. The next prime is 220442029. The reversal of 220442021 is 120244022.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3940225 + 216501796 = 1985^2 + 14714^2 .

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 220442021 - 2² = 220442017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220442029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1511 + ... + 21051.

It is an arithmetic number, because the mean of its divisors is an integer number (28580175).

Almost surely, 2^220442021 is an apocalyptic number.

It is an amenable number.

220442021 is a deficient number, since it is larger than the sum of its proper divisors (8199379).

220442021 is a wasteful number, since it uses less digits than its factorization.

220442021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19959.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 220442021 is about 14847.2900220882. The cubic root of 220442021 is about 604.0851058023.

Adding to 220442021 its reverse (120244022), we get a palindrome (340686043).

The spelling of 220442021 in words is "two hundred twenty million, four hundred forty-two thousand, twenty-one".