21320212323 has 8 divisors (see below), whose sum is σ = 28430903488. Its totient is φ = 14211498024.

The previous prime is 21320212307. The next prime is 21320212327. The reversal of 21320212323 is 32321202312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21320212323 - 2⁴ = 21320212307 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 21320212323.

It is not an unprimeable number, because it can be changed into a prime (21320212327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 468865 + ... + 512322.

It is an arithmetic number, because the mean of its divisors is an integer number (3553862936).

Almost surely, 2^21320212323 is an apocalyptic number.

21320212323 is a deficient number, since it is larger than the sum of its proper divisors (7110691165).

21320212323 is an equidigital number, since it uses as much as digits as its factorization.

21320212323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988433.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21320212323 its reverse (32321202312), we get a palindrome (53641414635).

The spelling of 21320212323 in words is "twenty-one billion, three hundred twenty million, two hundred twelve thousand, three hundred twenty-three".