20201022120221 has 2 divisors, whose sum is σ = 20201022120222. Its totient is φ = 20201022120220.

The previous prime is 20201022120187. The next prime is 20201022120299. The reversal of 20201022120221 is 12202122010202.

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., 18862639216996 + 1338382903225 = 4343114^2 + 1156885^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201022120221 - 2⁶ = 20201022120157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20201022120221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20201022420221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100511060110 + 10100511060111.

It is an arithmetic number, because the mean of its divisors is an integer number (10100511060111).

Almost surely, 2^{20201022120221} is an apocalyptic number.

It is an amenable number.

20201022120221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201022120221 is an equidigital number, since it uses as much as digits as its factorization.

20201022120221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20201022120221 its reverse (12202122010202), we get a palindrome (32403144130423).

The spelling of 20201022120221 in words is "twenty trillion, two hundred one billion, twenty-two million, one hundred twenty thousand, two hundred twenty-one".