21213311323 has 4 divisors (see below), whose sum is σ = 21274094800. Its totient is φ = 21152527848.

The previous prime is 21213311293. The next prime is 21213311341. The reversal of 21213311323 is 32311331212.

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 21213311323 - 2²⁵ = 21179756891 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21213311294 and 21213311303.

It is not an unprimeable number, because it can be changed into a prime (21213311923) 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, 30391215 + ... + 30391912.

It is an arithmetic number, because the mean of its divisors is an integer number (5318523700).

Almost surely, 2^21213311323 is an apocalyptic number.

21213311323 is a deficient number, since it is larger than the sum of its proper divisors (60783477).

21213311323 is an equidigital number, since it uses as much as digits as its factorization.

21213311323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60783476.

The product of its digits is 648, while the sum is 22.

Adding to 21213311323 its reverse (32311331212), we get a palindrome (53524642535).

The spelling of 21213311323 in words is "twenty-one billion, two hundred thirteen million, three hundred eleven thousand, three hundred twenty-three".