20012201110021 has 2 divisors, whose sum is σ = 20012201110022. Its totient is φ = 20012201110020.

The previous prime is 20012201110019. The next prime is 20012201110037. The reversal of 20012201110021 is 12001110221002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14537939508225 + 5474261601796 = 3812865^2 + 2339714^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012201110021 - 2¹ = 20012201110019 is a prime.

Together with 20012201110019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20012201109983 and 20012201110010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20012201110061) 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, 10006100555010 + 10006100555011.

It is an arithmetic number, because the mean of its divisors is an integer number (10006100555011).

Almost surely, 2^{20012201110021} is an apocalyptic number.

It is an amenable number.

20012201110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012201110021 is an equidigital number, since it uses as much as digits as its factorization.

20012201110021 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 13.

Adding to 20012201110021 its reverse (12001110221002), we get a palindrome (32013311331023).

It can be divided in two parts, 200 and 12201110021, that added together give a palindrome (12201110221).

The spelling of 20012201110021 in words is "twenty trillion, twelve billion, two hundred one million, one hundred ten thousand, twenty-one".