100111202020021 has 2 divisors, whose sum is σ = 100111202020022. Its totient is φ = 100111202020020.

The previous prime is 100111202019887. The next prime is 100111202020031. The reversal of 100111202020021 is 120020202111001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92488881688996 + 7622320331025 = 9617114^2 + 2760855^2 .

It is a cyclic number.

It is not a de Polignac number, because 100111202020021 - 2⁴³ = 91315108997813 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100111202019983 and 100111202020010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100111202020031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50055601010010 + 50055601010011.

It is an arithmetic number, because the mean of its divisors is an integer number (50055601010011).

Almost surely, 2^{100111202020021} is an apocalyptic number.

It is an amenable number.

100111202020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100111202020021 is an equidigital number, since it uses as much as digits as its factorization.

100111202020021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 100111202020021 its reverse (120020202111001), we get a palindrome (220131404131022).

The spelling of 100111202020021 in words is "one hundred trillion, one hundred eleven billion, two hundred two million, twenty thousand, twenty-one".