21243311411 has 8 divisors (see below), whose sum is σ = 24393133824. Its totient is φ = 18122254920.

The previous prime is 21243311377. The next prime is 21243311417. The reversal of 21243311411 is 11411334212.

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

It is a de Polignac number, because none of the positive numbers 2^k-21243311411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21243311417) 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, 7189895 + ... + 7192848.

It is an arithmetic number, because the mean of its divisors is an integer number (3049141728).

Almost surely, 2^21243311411 is an apocalyptic number.

21243311411 is a deficient number, since it is larger than the sum of its proper divisors (3149822413).

21243311411 is a wasteful number, since it uses less digits than its factorization.

21243311411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14382961.

The product of its digits is 576, while the sum is 23.

Adding to 21243311411 its reverse (11411334212), we get a palindrome (32654645623).

The spelling of 21243311411 in words is "twenty-one billion, two hundred forty-three million, three hundred eleven thousand, four hundred eleven".