21011320211 has 8 divisors (see below), whose sum is σ = 24019342080. Its totient is φ = 18004899528.

The previous prime is 21011320133. The next prime is 21011320217. The reversal of 21011320211 is 11202311012.

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

It is not a de Polignac number, because 21011320211 - 2¹⁰ = 21011319187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011320217) 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 7 ways as a sum of consecutive naturals, for example, 372041 + ... + 424778.

It is an arithmetic number, because the mean of its divisors is an integer number (3002417760).

Almost surely, 2^21011320211 is an apocalyptic number.

21011320211 is a deficient number, since it is larger than the sum of its proper divisors (3008021869).

21011320211 is an equidigital number, since it uses as much as digits as its factorization.

21011320211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800593.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21011320211 its reverse (11202311012), we get a palindrome (32213631223).

The spelling of 21011320211 in words is "twenty-one billion, eleven million, three hundred twenty thousand, two hundred eleven".