200020001221 has 2 divisors, whose sum is σ = 200020001222. Its totient is φ = 200020001220.

The previous prime is 200020001189. The next prime is 200020001243. The reversal of 200020001221 is 122100020002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166373436321 + 33646564900 = 407889^2 + 183430^2 .

It is a cyclic number.

It is not a de Polignac number, because 200020001221 - 2⁵ = 200020001189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 200020001198 and 200020001207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200020001281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100010000610 + 100010000611.

It is an arithmetic number, because the mean of its divisors is an integer number (100010000611).

Almost surely, 2^200020001221 is an apocalyptic number.

It is an amenable number.

200020001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

200020001221 is an equidigital number, since it uses as much as digits as its factorization.

200020001221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 200020001221 its reverse (122100020002), we get a palindrome (322120021223).

The spelling of 200020001221 in words is "two hundred billion, twenty million, one thousand, two hundred twenty-one".