101011200020021 has 2 divisors, whose sum is σ = 101011200020022. Its totient is φ = 101011200020020.

The previous prime is 101011200019967. The next prime is 101011200020063. The reversal of 101011200020021 is 120020002110101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97794575704996 + 3216624315025 = 9889114^2 + 1793495^2 .

It is a cyclic number.

It is not a de Polignac number, because 101011200020021 - 2¹⁸ = 101011199757877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 101011200019984 and 101011200020011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101011200023021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50505600010010 + 50505600010011.

It is an arithmetic number, because the mean of its divisors is an integer number (50505600010011).

Almost surely, 2^{101011200020021} is an apocalyptic number.

It is an amenable number.

101011200020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

101011200020021 is an equidigital number, since it uses as much as digits as its factorization.

101011200020021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 101011200020021 its reverse (120020002110101), we get a palindrome (221031202130122).

The spelling of 101011200020021 in words is "one hundred one trillion, eleven billion, two hundred million, twenty thousand, twenty-one".