20223221 has 2 divisors, whose sum is σ = 20223222. Its totient is φ = 20223220.

The previous prime is 20223193. The next prime is 20223257. The reversal of 20223221 is 12232202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12327121 + 7896100 = 3511^2 + 2810^2 .

It is a cyclic number.

It is not a de Polignac number, because 20223221 - 2²² = 16028917 is a prime.

It is a super-2 number, since 2×20223221² = 817957335229682, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20223196 and 20223205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20226221) 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 as a sum of consecutive naturals, namely, 10111610 + 10111611.

It is an arithmetic number, because the mean of its divisors is an integer number (10111611).

Almost surely, 2^20223221 is an apocalyptic number.

It is an amenable number.

20223221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20223221 is an equidigital number, since it uses as much as digits as its factorization.

20223221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20223221 is about 4497.0235712080. The cubic root of 20223221 is about 272.4478861148.

Adding to 20223221 its reverse (12232202), we get a palindrome (32455423).

The spelling of 20223221 in words is "twenty million, two hundred twenty-three thousand, two hundred twenty-one".