21310111101 has 4 divisors (see below), whose sum is σ = 28413481472. Its totient is φ = 14206740732.

The previous prime is 21310111079. The next prime is 21310111127. The reversal of 21310111101 is 10111101312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21310111101 - 2⁶ = 21310111037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310111001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3551685181 + ... + 3551685186.

It is an arithmetic number, because the mean of its divisors is an integer number (7103370368).

Almost surely, 2^21310111101 is an apocalyptic number.

It is an amenable number.

21310111101 is a deficient number, since it is larger than the sum of its proper divisors (7103370371).

21310111101 is an equidigital number, since it uses as much as digits as its factorization.

21310111101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7103370370.

The product of its (nonzero) digits is 6, while the sum is 12.

Adding to 21310111101 its reverse (10111101312), we get a palindrome (31421212413).

The spelling of 21310111101 in words is "twenty-one billion, three hundred ten million, one hundred eleven thousand, one hundred one".