21102000011 has 4 divisors (see below), whose sum is σ = 21102291000. Its totient is φ = 21101709024.

The previous prime is 21101999969. The next prime is 21102000097. The reversal of 21102000011 is 11000020112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21102000011 - 2¹⁰ = 21101998987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21102000511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60515 + ... + 214163.

It is an arithmetic number, because the mean of its divisors is an integer number (5275572750).

Almost surely, 2^21102000011 is an apocalyptic number.

21102000011 is a deficient number, since it is larger than the sum of its proper divisors (290989).

21102000011 is a wasteful number, since it uses less digits than its factorization.

21102000011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290988.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21102000011 its reverse (11000020112), we get a palindrome (32102020123).

The spelling of 21102000011 in words is "twenty-one billion, one hundred two million, eleven", and thus it is an aban number.