20012200100021 has 2 divisors, whose sum is σ = 20012200100022. Its totient is φ = 20012200100020.

The previous prime is 20012200099951. The next prime is 20012200100033. The reversal of 20012200100021 is 12000100221002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19350761102500 + 661438997521 = 4398950^2 + 813289^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012200100021 - 2²² = 20012195905717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20012200099975 and 20012200100011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20012200100071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006100050010 + 10006100050011.

It is an arithmetic number, because the mean of its divisors is an integer number (10006100050011).

Almost surely, 2^{20012200100021} is an apocalyptic number.

It is an amenable number.

20012200100021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012200100021 is an equidigital number, since it uses as much as digits as its factorization.

20012200100021 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 11.

Adding to 20012200100021 its reverse (12000100221002), we get a palindrome (32012300321023).

It can be divided in two parts, 200 and 12200100021, that added together give a palindrome (12200100221).

The spelling of 20012200100021 in words is "twenty trillion, twelve billion, two hundred million, one hundred thousand, twenty-one".