21201110101201 has 4 divisors (see below), whose sum is σ = 21239173136052. Its totient is φ = 21163047066352.

The previous prime is 21201110101163. The next prime is 21201110101253. The reversal of 21201110101201 is 10210101110212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 512439790801 + 20688670310400 = 715849^2 + 4548480^2 .

It is a cyclic number.

It is not a de Polignac number, because 21201110101201 - 2⁹ = 21201110100689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21201110191201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19031516590 + ... + 19031517703.

It is an arithmetic number, because the mean of its divisors is an integer number (5309793284013).

Almost surely, 2^{21201110101201} is an apocalyptic number.

It is an amenable number.

21201110101201 is a deficient number, since it is larger than the sum of its proper divisors (38063034851).

21201110101201 is an equidigital number, since it uses as much as digits as its factorization.

21201110101201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38063034850.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21201110101201 its reverse (10210101110212), we get a palindrome (31411211211413).

The spelling of 21201110101201 in words is "twenty-one trillion, two hundred one billion, one hundred ten million, one hundred one thousand, two hundred one".