20010120002221 has 2 divisors, whose sum is σ = 20010120002222. Its totient is φ = 20010120002220.

The previous prime is 20010120002207. The next prime is 20010120002273. The reversal of 20010120002221 is 12220002101002.

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., 10989191850025 + 9020928152196 = 3314995^2 + 3003486^2 .

It is a cyclic number.

It is not a de Polignac number, because 20010120002221 - 2¹⁵ = 20010119969453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20010120002291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005060001110 + 10005060001111.

It is an arithmetic number, because the mean of its divisors is an integer number (10005060001111).

Almost surely, 2^{20010120002221} is an apocalyptic number.

It is an amenable number.

20010120002221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20010120002221 is an equidigital number, since it uses as much as digits as its factorization.

20010120002221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20010120002221 its reverse (12220002101002), we get a palindrome (32230122103223).

The spelling of 20010120002221 in words is "twenty trillion, ten billion, one hundred twenty million, two thousand, two hundred twenty-one".