21103201311323 has 4 divisors (see below), whose sum is σ = 22344566094360. Its totient is φ = 19861836528288.

The previous prime is 21103201311301. The next prime is 21103201311349. The reversal of 21103201311323 is 32311310230112.

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 21103201311323 - 2²⁶ = 21103134202459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21103201311523) 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, 620682391493 + ... + 620682391526.

It is an arithmetic number, because the mean of its divisors is an integer number (5586141523590).

Almost surely, 2^{21103201311323} is an apocalyptic number.

21103201311323 is a deficient number, since it is larger than the sum of its proper divisors (1241364783037).

21103201311323 is a wasteful number, since it uses less digits than its factorization.

21103201311323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241364783036.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 21103201311323 its reverse (32311310230112), we get a palindrome (53414511541435).

The spelling of 21103201311323 in words is "twenty-one trillion, one hundred three billion, two hundred one million, three hundred eleven thousand, three hundred twenty-three".