100101200021 has 2 divisors, whose sum is σ = 100101200022. Its totient is φ = 100101200020.

The previous prime is 100101199981. The next prime is 100101200027. The reversal of 100101200021 is 120002101001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50243222500 + 49857977521 = 224150^2 + 223289^2 .

It is a cyclic number.

It is not a de Polignac number, because 100101200021 - 2¹⁸ = 100100937877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100101199981 and 100101200008.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100101200027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50050600010 + 50050600011.

It is an arithmetic number, because the mean of its divisors is an integer number (50050600011).

Almost surely, 2^100101200021 is an apocalyptic number.

It is an amenable number.

100101200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100101200021 is an equidigital number, since it uses as much as digits as its factorization.

100101200021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 100101200021 its reverse (120002101001), we get a palindrome (220103301022).

The spelling of 100101200021 in words is "one hundred billion, one hundred one million, two hundred thousand, twenty-one".