21213301323 has 4 divisors (see below), whose sum is σ = 28284401768. Its totient is φ = 14142200880.

The previous prime is 21213301273. The next prime is 21213301349. The reversal of 21213301323 is 32310331212.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21213301323 - 2⁶ = 21213301259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21213301323.

It is not an unprimeable number, because it can be changed into a prime (21213301523) 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, 3535550218 + ... + 3535550223.

It is an arithmetic number, because the mean of its divisors is an integer number (7071100442).

Almost surely, 2^21213301323 is an apocalyptic number.

21213301323 is a deficient number, since it is larger than the sum of its proper divisors (7071100445).

21213301323 is an equidigital number, since it uses as much as digits as its factorization.

21213301323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7071100444.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21213301323 its reverse (32310331212), we get a palindrome (53523632535).

The spelling of 21213301323 in words is "twenty-one billion, two hundred thirteen million, three hundred one thousand, three hundred twenty-three".