21100323323 has 4 divisors (see below), whose sum is σ = 21157817760. Its totient is φ = 21042828888.

The previous prime is 21100323319. The next prime is 21100323337. The reversal of 21100323323 is 32332300112.

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 21100323323 - 2² = 21100323319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21100323295 and 21100323304.

It is not an unprimeable number, because it can be changed into a prime (21100373323) 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, 28746668 + ... + 28747401.

It is an arithmetic number, because the mean of its divisors is an integer number (5289454440).

Almost surely, 2^21100323323 is an apocalyptic number.

21100323323 is a deficient number, since it is larger than the sum of its proper divisors (57494437).

21100323323 is an equidigital number, since it uses as much as digits as its factorization.

21100323323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57494436.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21100323323 its reverse (32332300112), we get a palindrome (53432623435).

The spelling of 21100323323 in words is "twenty-one billion, one hundred million, three hundred twenty-three thousand, three hundred twenty-three".