21311331201323 has 8 divisors (see below), whose sum is σ = 21629670836880. Its totient is φ = 20992999214880.

The previous prime is 21311331201313. The next prime is 21311331201331. The reversal of 21311331201323 is 32310213311312.

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

It is a cyclic number.

It is not a de Polignac number, because 21311331201323 - 2³⁰ = 21310257459499 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21311331201292 and 21311331201301.

It is not an unprimeable number, because it can be changed into a prime (21311331201313) 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, 3829373 + ... + 7568801.

It is an arithmetic number, because the mean of its divisors is an integer number (2703708854610).

Almost surely, 2^{21311331201323} is an apocalyptic number.

21311331201323 is a deficient number, since it is larger than the sum of its proper divisors (318339635557).

21311331201323 is an equidigital number, since it uses as much as digits as its factorization.

21311331201323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3824557.

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 21311331201323 its reverse (32310213311312), we get a palindrome (53621544512635).

The spelling of 21311331201323 in words is "twenty-one trillion, three hundred eleven billion, three hundred thirty-one million, two hundred one thousand, three hundred twenty-three".