1020220221 has 4 divisors (see below), whose sum is σ = 1360293632. Its totient is φ = 680146812.

The previous prime is 1020220207. The next prime is 1020220241. The reversal of 1020220221 is 1220220201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1020220221 - 2¹⁰ = 1020219197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020220197 and 1020220206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020220241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170036701 + ... + 170036706.

It is an arithmetic number, because the mean of its divisors is an integer number (340073408).

Almost surely, 2^1020220221 is an apocalyptic number.

It is an amenable number.

1020220221 is a deficient number, since it is larger than the sum of its proper divisors (340073411).

1020220221 is an equidigital number, since it uses as much as digits as its factorization.

1020220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340073410.

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

The square root of 1020220221 is about 31940.8863527611. The cubic root of 1020220221 is about 1006.6951486150.

Adding to 1020220221 its reverse (1220220201), we get a palindrome (2240440422).

The spelling of 1020220221 in words is "one billion, twenty million, two hundred twenty thousand, two hundred twenty-one".