21331312111 has 8 divisors (see below), whose sum is σ = 22008905280. Its totient is φ = 20663908512.

The previous prime is 21331312087. The next prime is 21331312199. The reversal of 21331312111 is 11121313312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21331312111 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 (21331315111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2543140 + ... + 2551513.

It is an arithmetic number, because the mean of its divisors is an integer number (2751113160).

Almost surely, 2^21331312111 is an apocalyptic number.

21331312111 is a deficient number, since it is larger than the sum of its proper divisors (677593169).

21331312111 is an equidigital number, since it uses as much as digits as its factorization.

21331312111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5094785.

The product of its digits is 108, while the sum is 19.

Adding to 21331312111 its reverse (11121313312), we get a palindrome (32452625423).

The spelling of 21331312111 in words is "twenty-one billion, three hundred thirty-one million, three hundred twelve thousand, one hundred eleven".