21331201323 has 16 divisors (see below), whose sum is σ = 29145777696. Its totient is φ = 13868962560.

The previous prime is 21331201303. The next prime is 21331201357. The reversal of 21331201323 is 32310213312.

It is not a de Polignac number, because 21331201323 - 2¹² = 21331197227 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21331201323.

It is not an unprimeable number, because it can be changed into a prime (21331201303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 329065 + ... + 388517.

It is an arithmetic number, because the mean of its divisors is an integer number (1821611106).

Almost surely, 2^21331201323 is an apocalyptic number.

21331201323 is a deficient number, since it is larger than the sum of its proper divisors (7814576373).

21331201323 is a wasteful number, since it uses less digits than its factorization.

21331201323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62414.

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

Adding to 21331201323 its reverse (32310213312), we get a palindrome (53641414635).

The spelling of 21331201323 in words is "twenty-one billion, three hundred thirty-one million, two hundred one thousand, three hundred twenty-three".