21321311133221 has 8 divisors (see below), whose sum is σ = 23316481617600. Its totient is φ = 19335618894240.

The previous prime is 21321311133209. The next prime is 21321311133223. The reversal of 21321311133221 is 12233111312312.

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

It is not a de Polignac number, because 21321311133221 - 2³⁴ = 21304131264037 is a prime.

It is a super-2 number, since 2×21321311133221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321311133223) 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, 2369556641 + ... + 2369565638.

It is an arithmetic number, because the mean of its divisors is an integer number (2914560202200).

Almost surely, 2^{21321311133221} is an apocalyptic number.

It is an amenable number.

21321311133221 is a deficient number, since it is larger than the sum of its proper divisors (1995170484379).

21321311133221 is a wasteful number, since it uses less digits than its factorization.

21321311133221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4739122699.

The product of its digits is 1296, while the sum is 26.

Adding to 21321311133221 its reverse (12233111312312), we get a palindrome (33554422445533).

The spelling of 21321311133221 in words is "twenty-one trillion, three hundred twenty-one billion, three hundred eleven million, one hundred thirty-three thousand, two hundred twenty-one".