20003333221 has 2 divisors, whose sum is σ = 20003333222. Its totient is φ = 20003333220.

The previous prime is 20003333213. The next prime is 20003333227. The reversal of 20003333221 is 12233330002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10839100321 + 9164232900 = 104111^2 + 95730^2 .

It is a cyclic number.

It is not a de Polignac number, because 20003333221 - 2³ = 20003333213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20003333227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001666610 + 10001666611.

It is an arithmetic number, because the mean of its divisors is an integer number (10001666611).

Almost surely, 2^20003333221 is an apocalyptic number.

It is an amenable number.

20003333221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20003333221 is an equidigital number, since it uses as much as digits as its factorization.

20003333221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 19.

Adding to 20003333221 its reverse (12233330002), we get a palindrome (32236663223).

The spelling of 20003333221 in words is "twenty billion, three million, three hundred thirty-three thousand, two hundred twenty-one".