21310111344023 has 4 divisors (see below), whose sum is σ = 21311151744888. Its totient is φ = 21309070943160.

The previous prime is 21310111344013. The next prime is 21310111344047. The reversal of 21310111344023 is 32044311101312.

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 21310111344023 - 2⁴ = 21310111344007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21310111343983 and 21310111344001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310111344013) 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, 520169708 + ... + 520210673.

It is an arithmetic number, because the mean of its divisors is an integer number (5327787936222).

Almost surely, 2^{21310111344023} is an apocalyptic number.

21310111344023 is a deficient number, since it is larger than the sum of its proper divisors (1040400865).

21310111344023 is a wasteful number, since it uses less digits than its factorization.

21310111344023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040400864.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 21310111344023 its reverse (32044311101312), we get a palindrome (53354422445335).

The spelling of 21310111344023 in words is "twenty-one trillion, three hundred ten billion, one hundred eleven million, three hundred forty-four thousand, twenty-three".