2220221021 has 8 divisors (see below), whose sum is σ = 2272500384. Its totient is φ = 2167971120.

The previous prime is 2220220999. The next prime is 2220221071. The reversal of 2220221021 is 1201220222.

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 2220221021 - 2⁶ = 2220220957 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 = 2220220987 and 2220221005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220221071) 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, 246131 + ... + 254991.

It is an arithmetic number, because the mean of its divisors is an integer number (284062548).

Almost surely, 2^2220221021 is an apocalyptic number.

It is an amenable number.

2220221021 is a deficient number, since it is larger than the sum of its proper divisors (52279363).

2220221021 is an equidigital number, since it uses as much as digits as its factorization.

2220221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14731.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 2220221021 is about 47119.2213539231. The cubic root of 2220221021 is about 1304.5640408482.

Adding to 2220221021 its reverse (1201220222), we get a palindrome (3421441243).

The spelling of 2220221021 in words is "two billion, two hundred twenty million, two hundred twenty-one thousand, twenty-one".