21111331411 has 4 divisors (see below), whose sum is σ = 21134304400. Its totient is φ = 21088358424.

The previous prime is 21111331387. The next prime is 21111331447. The reversal of 21111331411 is 11413311112.

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 21111331411 - 2⁹ = 21111330899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111331211) 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, 11485116 + ... + 11486953.

It is an arithmetic number, because the mean of its divisors is an integer number (5283576100).

Almost surely, 2^21111331411 is an apocalyptic number.

21111331411 is a deficient number, since it is larger than the sum of its proper divisors (22972989).

21111331411 is an equidigital number, since it uses as much as digits as its factorization.

21111331411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22972988.

The product of its digits is 72, while the sum is 19.

Adding to 21111331411 its reverse (11413311112), we get a palindrome (32524642523).

The spelling of 21111331411 in words is "twenty-one billion, one hundred eleven million, three hundred thirty-one thousand, four hundred eleven".