20020221011221 has 2 divisors, whose sum is σ = 20020221011222. Its totient is φ = 20020221011220.

The previous prime is 20020221011207. The next prime is 20020221011251. The reversal of 20020221011221 is 12211012202002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12007437780625 + 8012783230596 = 3465175^2 + 2830686^2 .

It is a cyclic number.

It is not a de Polignac number, because 20020221011221 - 2¹⁵ = 20020220978453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20020221011195 and 20020221011204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20020221011251) 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, 10010110505610 + 10010110505611.

It is an arithmetic number, because the mean of its divisors is an integer number (10010110505611).

Almost surely, 2^{20020221011221} is an apocalyptic number.

It is an amenable number.

20020221011221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020221011221 is an equidigital number, since it uses as much as digits as its factorization.

20020221011221 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 16.

Adding to 20020221011221 its reverse (12211012202002), we get a palindrome (32231233213223).

The spelling of 20020221011221 in words is "twenty trillion, twenty billion, two hundred twenty-one million, eleven thousand, two hundred twenty-one".