21001201110001 has 4 divisors (see below), whose sum is σ = 24001372697152. Its totient is φ = 18001029522852.

The previous prime is 21001201109969. The next prime is 21001201110007. The reversal of 21001201110001 is 10001110210012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21001201110001 - 2⁵ = 21001201109969 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 21001201110001.

It is not an unprimeable number, because it can be changed into a prime (21001201110007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1500085793565 + ... + 1500085793578.

It is an arithmetic number, because the mean of its divisors is an integer number (6000343174288).

Almost surely, 2^{21001201110001} is an apocalyptic number.

It is an amenable number.

21001201110001 is a deficient number, since it is larger than the sum of its proper divisors (3000171587151).

21001201110001 is an equidigital number, since it uses as much as digits as its factorization.

21001201110001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3000171587150.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21001201110001 its reverse (10001110210012), we get a palindrome (31002311320013).

The spelling of 21001201110001 in words is "twenty-one trillion, one billion, two hundred one million, one hundred ten thousand, one".