21323023331 has 8 divisors (see below), whose sum is σ = 21422396880. Its totient is φ = 21223704672.

The previous prime is 21323023297. The next prime is 21323023339. The reversal of 21323023331 is 13332032312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21323023331 is a prime.

It is a super-2 number, since 2×21323023331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21323023297 and 21323023306.

It is not an unprimeable number, because it can be changed into a prime (21323023339) 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, 907376 + ... + 930578.

It is an arithmetic number, because the mean of its divisors is an integer number (2677799610).

Almost surely, 2^21323023331 is an apocalyptic number.

21323023331 is a deficient number, since it is larger than the sum of its proper divisors (99373549).

21323023331 is a wasteful number, since it uses less digits than its factorization.

21323023331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27445.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21323023331 its reverse (13332032312), we get a palindrome (34655055643).

The spelling of 21323023331 in words is "twenty-one billion, three hundred twenty-three million, twenty-three thousand, three hundred thirty-one".