21331210323 has 8 divisors (see below), whose sum is σ = 28616102848. Its totient is φ = 14133562344.

The previous prime is 21331210259. The next prime is 21331210399. The reversal of 21331210323 is 32301213312.

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

It is not a de Polignac number, because 21331210323 - 2⁶ = 21331210259 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 21331210323.

It is not an unprimeable number, because it can be changed into a prime (21331210223) 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, 21810565 + ... + 21811542.

It is an arithmetic number, because the mean of its divisors is an integer number (3577012856).

Almost surely, 2^21331210323 is an apocalyptic number.

21331210323 is a deficient number, since it is larger than the sum of its proper divisors (7284892525).

21331210323 is a wasteful number, since it uses less digits than its factorization.

21331210323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43622273.

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

Adding to 21331210323 its reverse (32301213312), we get a palindrome (53632423635).

The spelling of 21331210323 in words is "twenty-one billion, three hundred thirty-one million, two hundred ten thousand, three hundred twenty-three".