220013021 has 8 divisors (see below), whose sum is σ = 223762680. Its totient is φ = 216283392.

The previous prime is 220012993. The next prime is 220013023. The reversal of 220013021 is 120310022.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 35868121 + 184144900 = 5989^2 + 13570^2 .

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 220013021 - 2²² = 215818717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 220012993 and 220013011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220013023) 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, 18035 + ... + 27663.

It is an arithmetic number, because the mean of its divisors is an integer number (27970335).

Almost surely, 2^220013021 is an apocalyptic number.

It is an amenable number.

220013021 is a deficient number, since it is larger than the sum of its proper divisors (3749659).

220013021 is an equidigital number, since it uses as much as digits as its factorization.

220013021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10015.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 220013021 is about 14832.8359055172. The cubic root of 220013021 is about 603.6929833407.

Adding to 220013021 its reverse (120310022), we get a palindrome (340323043).

The spelling of 220013021 in words is "two hundred twenty million, thirteen thousand, twenty-one".