21001119001 has 2 divisors, whose sum is σ = 21001119002. Its totient is φ = 21001119000.

The previous prime is 21001118989. The next prime is 21001119011. The reversal of 21001119001 is 10091110012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18373531401 + 2627587600 = 135549^2 + 51260^2 .

It is a cyclic number.

It is not a de Polignac number, because 21001119001 - 2¹¹ = 21001116953 is a prime.

It is not a weakly prime, because it can be changed into another prime (21001119011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500559500 + 10500559501.

It is an arithmetic number, because the mean of its divisors is an integer number (10500559501).

Almost surely, 2^21001119001 is an apocalyptic number.

It is an amenable number.

21001119001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001119001 is an equidigital number, since it uses as much as digits as its factorization.

21001119001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 16.

Adding to 21001119001 its reverse (10091110012), we get a palindrome (31092229013).

The spelling of 21001119001 in words is "twenty-one billion, one million, one hundred nineteen thousand, one".