20226221 has 2 divisors, whose sum is σ = 20226222. Its totient is φ = 20226220.

The previous prime is 20226191. The next prime is 20226233. The reversal of 20226221 is 12262202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12040900 + 8185321 = 3470^2 + 2861^2 .

It is a cyclic number.

It is not a de Polignac number, because 20226221 - 2¹⁴ = 20209837 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20226221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20226281) 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, 10113110 + 10113111.

It is an arithmetic number, because the mean of its divisors is an integer number (10113111).

Almost surely, 2^20226221 is an apocalyptic number.

It is an amenable number.

20226221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20226221 is an equidigital number, since it uses as much as digits as its factorization.

20226221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 20226221 is about 4497.3571127941. The cubic root of 20226221 is about 272.4613574809.

Adding to 20226221 its reverse (12262202), we get a palindrome (32488423).

The spelling of 20226221 in words is "twenty million, two hundred twenty-six thousand, two hundred twenty-one".