21223113533221 has 8 divisors (see below), whose sum is σ = 21251868500864. Its totient is φ = 21194359884000.

The previous prime is 21223113533201. The next prime is 21223113533239. The reversal of 21223113533221 is 12233531132212.

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 21223113533221 - 2⁷ = 21223113533093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223113533201) 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, 34354750 + ... + 34967056.

It is an arithmetic number, because the mean of its divisors is an integer number (2656483562608).

Almost surely, 2^{21223113533221} is an apocalyptic number.

It is an amenable number.

21223113533221 is a deficient number, since it is larger than the sum of its proper divisors (28754967643).

21223113533221 is an equidigital number, since it uses as much as digits as its factorization.

21223113533221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659211.

The product of its digits is 12960, while the sum is 31.

Adding to 21223113533221 its reverse (12233531132212), we get a palindrome (33456644665433).

The spelling of 21223113533221 in words is "twenty-one trillion, two hundred twenty-three billion, one hundred thirteen million, five hundred thirty-three thousand, two hundred twenty-one".