21011303111201 has 4 divisors (see below), whose sum is σ = 22627557196692. Its totient is φ = 19395049025712.

The previous prime is 21011303111159. The next prime is 21011303111203. The reversal of 21011303111201 is 10211130311012.

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 2894353638400 + 18116949472801 = 1701280^2 + 4256401^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21011303111201 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21011303111201.

It is not an unprimeable number, because it can be changed into a prime (21011303111203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 808127042726 + ... + 808127042751.

It is an arithmetic number, because the mean of its divisors is an integer number (5656889299173).

Almost surely, 2^{21011303111201} is an apocalyptic number.

It is an amenable number.

21011303111201 is a deficient number, since it is larger than the sum of its proper divisors (1616254085491).

21011303111201 is a wasteful number, since it uses less digits than its factorization.

21011303111201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1616254085490.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 21011303111201 its reverse (10211130311012), we get a palindrome (31222433422213).

The spelling of 21011303111201 in words is "twenty-one trillion, eleven billion, three hundred three million, one hundred eleven thousand, two hundred one".