21322112331221 has 8 divisors (see below), whose sum is σ = 23960634593280. Its totient is φ = 18826212894192.

The previous prime is 21322112331211. The next prime is 21322112331257. The reversal of 21322112331221 is 12213321122312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21322112331221 is a prime.

It is a super-2 number, since 2×21322112331221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21322112331211) 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, 35655705941 + ... + 35655706538.

It is an arithmetic number, because the mean of its divisors is an integer number (2995079324160).

Almost surely, 2^{21322112331221} is an apocalyptic number.

It is an amenable number.

21322112331221 is a deficient number, since it is larger than the sum of its proper divisors (2638522262059).

21322112331221 is a wasteful number, since it uses less digits than its factorization.

21322112331221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71311412515.

The product of its digits is 1728, while the sum is 26.

Adding to 21322112331221 its reverse (12213321122312), we get a palindrome (33535433453533).

The spelling of 21322112331221 in words is "twenty-one trillion, three hundred twenty-two billion, one hundred twelve million, three hundred thirty-one thousand, two hundred twenty-one".