20021020200221 has 2 divisors, whose sum is σ = 20021020200222. Its totient is φ = 20021020200220.

The previous prime is 20021020200211. The next prime is 20021020200227. The reversal of 20021020200221 is 12200202012002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11901540919321 + 8119479280900 = 3449861^2 + 2849470^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021020200221 - 2⁶ = 20021020200157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20021020200196 and 20021020200205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021020200227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010510100110 + 10010510100111.

It is an arithmetic number, because the mean of its divisors is an integer number (10010510100111).

Almost surely, 2^{20021020200221} is an apocalyptic number.

It is an amenable number.

20021020200221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021020200221 is an equidigital number, since it uses as much as digits as its factorization.

20021020200221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20021020200221 its reverse (12200202012002), we get a palindrome (32221222212223).

The spelling of 20021020200221 in words is "twenty trillion, twenty-one billion, twenty million, two hundred thousand, two hundred twenty-one".