220221021 has 8 divisors (see below), whose sum is σ = 306394560. Its totient is φ = 140430752.

The previous prime is 220221019. The next prime is 220221031. The reversal of 220221021 is 120122022.

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 220221021 - 2¹ = 220221019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220220988 and 220221006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220221031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1595736 + ... + 1595873.

It is an arithmetic number, because the mean of its divisors is an integer number (38299320).

Almost surely, 2^220221021 is an apocalyptic number.

It is an amenable number.

220221021 is a deficient number, since it is larger than the sum of its proper divisors (86173539).

220221021 is a wasteful number, since it uses less digits than its factorization.

220221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3191635.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 220221021 is about 14839.8457202223. The cubic root of 220221021 is about 603.8831669187.

Adding to 220221021 its reverse (120122022), we get a palindrome (340343043).

The spelling of 220221021 in words is "two hundred twenty million, two hundred twenty-one thousand, twenty-one".