9980221 has 2 divisors, whose sum is σ = 9980222. Its totient is φ = 9980220.

The previous prime is 9980209. The next prime is 9980227. The reversal of 9980221 is 1220899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8328996 + 1651225 = 2886^2 + 1285^2 .

It is a cyclic number.

It is not a de Polignac number, because 9980221 - 2¹³ = 9972029 is a prime.

It is a super-2 number, since 2×9980221² = 199209622417682, which contains 22 as substring.

9980221 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9980227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4990110 + 4990111.

It is an arithmetic number, because the mean of its divisors is an integer number (4990111).

Almost surely, 2^9980221 is an apocalyptic number.

It is an amenable number.

9980221 is a deficient number, since it is larger than the sum of its proper divisors (1).

9980221 is an equidigital number, since it uses as much as digits as its factorization.

9980221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 9980221 is about 3159.1487777564. The cubic root of 9980221 is about 215.3013333728.

It can be divided in two parts, 9980 and 221, that added together give a palindrome (10201).

The spelling of 9980221 in words is "nine million, nine hundred eighty thousand, two hundred twenty-one".