21106000811 has 4 divisors (see below), whose sum is σ = 24121143792. Its totient is φ = 18090857832.

The previous prime is 21106000771. The next prime is 21106000879. The reversal of 21106000811 is 11800060112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21106000811 - 2¹⁰ = 21105999787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21106000891) 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, 1507571480 + ... + 1507571493.

It is an arithmetic number, because the mean of its divisors is an integer number (6030285948).

Almost surely, 2^21106000811 is an apocalyptic number.

21106000811 is a deficient number, since it is larger than the sum of its proper divisors (3015142981).

21106000811 is an equidigital number, since it uses as much as digits as its factorization.

21106000811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3015142980.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 21106000811 its reverse (11800060112), we get a palindrome (32906060923).

The spelling of 21106000811 in words is "twenty-one billion, one hundred six million, eight hundred eleven", and thus it is an aban number.