21124344311 has 4 divisors (see below), whose sum is σ = 24142107792. Its totient is φ = 18106580832.

The previous prime is 21124344259. The next prime is 21124344317. The reversal of 21124344311 is 11344342112.

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 21124344311 - 2¹⁸ = 21124082167 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 (21124344317) 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, 1508881730 + ... + 1508881743.

It is an arithmetic number, because the mean of its divisors is an integer number (6035526948).

Almost surely, 2^21124344311 is an apocalyptic number.

21124344311 is a deficient number, since it is larger than the sum of its proper divisors (3017763481).

21124344311 is an equidigital number, since it uses as much as digits as its factorization.

21124344311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3017763480.

The product of its digits is 2304, while the sum is 26.

Adding to 21124344311 its reverse (11344342112), we get a palindrome (32468686423).

The spelling of 21124344311 in words is "twenty-one billion, one hundred twenty-four million, three hundred forty-four thousand, three hundred eleven".