21130310011 has 4 divisors (see below), whose sum is σ = 21131197624. Its totient is φ = 21129422400.

The previous prime is 21130309979. The next prime is 21130310051. The reversal of 21130310011 is 11001303112.

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 21130310011 - 2⁵ = 21130309979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21130309973 and 21130310000.

It is not an unprimeable number, because it can be changed into a prime (21130310051) 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, 407085 + ... + 456046.

It is an arithmetic number, because the mean of its divisors is an integer number (5282799406).

Almost surely, 2^21130310011 is an apocalyptic number.

21130310011 is a deficient number, since it is larger than the sum of its proper divisors (887613).

21130310011 is an equidigital number, since it uses as much as digits as its factorization.

21130310011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887612.

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 21130310011 its reverse (11001303112), we get a palindrome (32131613123).

The spelling of 21130310011 in words is "twenty-one billion, one hundred thirty million, three hundred ten thousand, eleven".