21232223321 has 4 divisors (see below), whose sum is σ = 22481177652. Its totient is φ = 19983268992.

The previous prime is 21232223317. The next prime is 21232223377. The reversal of 21232223321 is 12332223212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11023950025 + 10208273296 = 104995^2 + 101036^2 .

It is a cyclic number.

It is not a de Polignac number, because 21232223321 - 2² = 21232223317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21232225321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 624477140 + ... + 624477173.

It is an arithmetic number, because the mean of its divisors is an integer number (5620294413).

Almost surely, 2^21232223321 is an apocalyptic number.

It is an amenable number.

21232223321 is a deficient number, since it is larger than the sum of its proper divisors (1248954331).

21232223321 is a wasteful number, since it uses less digits than its factorization.

21232223321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248954330.

The product of its digits is 1728, while the sum is 23.

Adding to 21232223321 its reverse (12332223212), we get a palindrome (33564446533).

The spelling of 21232223321 in words is "twenty-one billion, two hundred thirty-two million, two hundred twenty-three thousand, three hundred twenty-one".