21233311321 has 8 divisors (see below), whose sum is σ = 23257582920. Its totient is φ = 19295179008.

The previous prime is 21233311303. The next prime is 21233311361. The reversal of 21233311321 is 12311333212.

It can be written as a sum of positive squares in 4 ways, for example, as 807184921 + 20426126400 = 28411^2 + 142920^2 .

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 21233311321 - 2⁷ = 21233311193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21233311292 and 21233311301.

It is not an unprimeable number, because it can be changed into a prime (21233311361) 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 7 ways as a sum of consecutive naturals, for example, 21534306 + ... + 21535291.

It is an arithmetic number, because the mean of its divisors is an integer number (2907197865).

Almost surely, 2^21233311321 is an apocalyptic number.

It is an amenable number.

21233311321 is a deficient number, since it is larger than the sum of its proper divisors (2024271599).

21233311321 is a wasteful number, since it uses less digits than its factorization.

21233311321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43069643.

The product of its digits is 648, while the sum is 22.

Adding to 21233311321 its reverse (12311333212), we get a palindrome (33544644533).

The spelling of 21233311321 in words is "twenty-one billion, two hundred thirty-three million, three hundred eleven thousand, three hundred twenty-one".