21223000233221 has 8 divisors (see below), whose sum is σ = 21962992589400. Its totient is φ = 20483552194560.

The previous prime is 21223000233199. The next prime is 21223000233229. The reversal of 21223000233221 is 12233200032212.

It can be written as a sum of positive squares in 4 ways, for example, as 4677223710721 + 16545776522500 = 2162689^2 + 4067650^2 .

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 21223000233221 - 2³⁴ = 21205820364037 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 (21223000233229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136000040 + ... + 136156001.

It is an arithmetic number, because the mean of its divisors is an integer number (2745374073675).

Almost surely, 2^{21223000233221} is an apocalyptic number.

It is an amenable number.

21223000233221 is a deficient number, since it is larger than the sum of its proper divisors (739992356179).

21223000233221 is a wasteful number, since it uses less digits than its factorization.

21223000233221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272158759.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21223000233221 its reverse (12233200032212), we get a palindrome (33456200265433).

The spelling of 21223000233221 in words is "twenty-one trillion, two hundred twenty-three billion, two hundred thirty-three thousand, two hundred twenty-one".