21230231321 has 8 divisors (see below), whose sum is σ = 22866105864. Its totient is φ = 19594753920.

The previous prime is 21230231299. The next prime is 21230231357. The reversal of 21230231321 is 12313203212.

It can be written as a sum of positive squares in 4 ways, for example, as 3524203225 + 17706028096 = 59365^2 + 133064^2 .

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 21230231321 - 2⁶ = 21230231257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21230231293 and 21230231302.

It is not an unprimeable number, because it can be changed into a prime (21230230321) 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, 16781 + ... + 206741.

It is an arithmetic number, because the mean of its divisors is an integer number (2858263233).

Almost surely, 2^21230231321 is an apocalyptic number.

It is an amenable number.

21230231321 is a deficient number, since it is larger than the sum of its proper divisors (1635874543).

21230231321 is a wasteful number, since it uses less digits than its factorization.

21230231321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198571.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21230231321 its reverse (12313203212), we get a palindrome (33543434533).

The spelling of 21230231321 in words is "twenty-one billion, two hundred thirty million, two hundred thirty-one thousand, three hundred twenty-one".