21100311211 has 12 divisors (see below), whose sum is σ = 24408735472. Its totient is φ = 17868036816.

The previous prime is 21100311203. The next prime is 21100311229. The reversal of 21100311211 is 11211300112.

It is a happy number.

It is not a de Polignac number, because 21100311211 - 2³ = 21100311203 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21100311191 and 21100311200.

It is not an unprimeable number, because it can be changed into a prime (21100341211) 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 11 ways as a sum of consecutive naturals, for example, 170556 + ... + 267001.

Almost surely, 2^21100311211 is an apocalyptic number.

21100311211 is a deficient number, since it is larger than the sum of its proper divisors (3308424261).

21100311211 is an frugal number, since it uses more digits than its factorization.

21100311211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437730 (or 437647 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21100311211 its reverse (11211300112), we get a palindrome (32311611323).

The spelling of 21100311211 in words is "twenty-one billion, one hundred million, three hundred eleven thousand, two hundred eleven".