21001021101211 has 8 divisors (see below), whose sum is σ = 21303131043600. Its totient is φ = 20700079863552.

The previous prime is 21001021101199. The next prime is 21001021101323. The reversal of 21001021101211 is 11210112010012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21001021101211 - 2⁹ = 21001021100699 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21001021101191 and 21001021101200.

It is not an unprimeable number, because it can be changed into a prime (21001021101911) 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 7 ways as a sum of consecutive naturals, for example, 292139986 + ... + 292211863.

It is an arithmetic number, because the mean of its divisors is an integer number (2662891380450).

Almost surely, 2^{21001021101211} is an apocalyptic number.

21001021101211 is a deficient number, since it is larger than the sum of its proper divisors (302109942389).

21001021101211 is an equidigital number, since it uses as much as digits as its factorization.

21001021101211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584352365.

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

Adding to 21001021101211 its reverse (11210112010012), we get a palindrome (32211133111223).

The spelling of 21001021101211 in words is "twenty-one trillion, one billion, twenty-one million, one hundred one thousand, two hundred eleven".