21311113411 has 4 divisors (see below), whose sum is σ = 24355558192. Its totient is φ = 18266668632.

The previous prime is 21311113409. The next prime is 21311113433. The reversal of 21311113411 is 11431111312.

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 21311113411 - 2¹ = 21311113409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21311113441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1522222380 + ... + 1522222393.

It is an arithmetic number, because the mean of its divisors is an integer number (6088889548).

Almost surely, 2^21311113411 is an apocalyptic number.

21311113411 is a deficient number, since it is larger than the sum of its proper divisors (3044444781).

21311113411 is an equidigital number, since it uses as much as digits as its factorization.

21311113411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3044444780.

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

Adding to 21311113411 its reverse (11431111312), we get a palindrome (32742224723).

The spelling of 21311113411 in words is "twenty-one billion, three hundred eleven million, one hundred thirteen thousand, four hundred eleven".