201101200021 has 2 divisors, whose sum is σ = 201101200022. Its totient is φ = 201101200020.

The previous prime is 201101199953. The next prime is 201101200063. The reversal of 201101200021 is 120002101102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170807797521 + 30293402500 = 413289^2 + 174050^2 .

It is a cyclic number.

It is not a de Polignac number, because 201101200021 - 2¹⁹ = 201100675733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201101199980 and 201101200007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201101203021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100550600010 + 100550600011.

It is an arithmetic number, because the mean of its divisors is an integer number (100550600011).

Almost surely, 2^201101200021 is an apocalyptic number.

It is an amenable number.

201101200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

201101200021 is an equidigital number, since it uses as much as digits as its factorization.

201101200021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 201101200021 its reverse (120002101102), we get a palindrome (321103301123).

The spelling of 201101200021 in words is "two hundred one billion, one hundred one million, two hundred thousand, twenty-one".