21212332331321 has 8 divisors (see below), whose sum is σ = 21217656049800. Its totient is φ = 21207009253248.

The previous prime is 21212332331291. The next prime is 21212332331347. The reversal of 21212332331321 is 12313323321212.

It can be written as a sum of positive squares in 4 ways, for example, as 1338211689721 + 19874120641600 = 1156811^2 + 4458040^2 .

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 21212332331321 - 2⁶ = 21212332331257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212332331371) 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, 69889325 + ... + 70192181.

It is an arithmetic number, because the mean of its divisors is an integer number (2652207006225).

Almost surely, 2^{21212332331321} is an apocalyptic number.

It is an amenable number.

21212332331321 is a deficient number, since it is larger than the sum of its proper divisors (5323718479).

21212332331321 is a wasteful number, since it uses less digits than its factorization.

21212332331321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320203.

The product of its digits is 7776, while the sum is 29.

Adding to 21212332331321 its reverse (12313323321212), we get a palindrome (33525655652533).

The spelling of 21212332331321 in words is "twenty-one trillion, two hundred twelve billion, three hundred thirty-two million, three hundred thirty-one thousand, three hundred twenty-one".