21124044323311 has 4 divisors (see below), whose sum is σ = 21124550584800. Its totient is φ = 21123538061824.

The previous prime is 21124044323309. The next prime is 21124044323357. The reversal of 21124044323311 is 11332344042112.

It is a happy number.

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 21124044323311 - 2¹ = 21124044323309 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 (21124044323611) 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, 253068151 + ... + 253151608.

It is an arithmetic number, because the mean of its divisors is an integer number (5281137646200).

Almost surely, 2^{21124044323311} is an apocalyptic number.

21124044323311 is a deficient number, since it is larger than the sum of its proper divisors (506261489).

21124044323311 is an equidigital number, since it uses as much as digits as its factorization.

21124044323311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506261488.

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 21124044323311 its reverse (11332344042112), we get a palindrome (32456388365423).

The spelling of 21124044323311 in words is "twenty-one trillion, one hundred twenty-four billion, forty-four million, three hundred twenty-three thousand, three hundred eleven".