21221322233 has 2 divisors, whose sum is σ = 21221322234. Its totient is φ = 21221322232.

The previous prime is 21221322179. The next prime is 21221322263. The reversal of 21221322233 is 33222312212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18640987024 + 2580335209 = 136532^2 + 50797^2 .

It is a cyclic number.

It is not a de Polignac number, because 21221322233 - 2²⁴ = 21204545017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21221322199 and 21221322208.

It is not a weakly prime, because it can be changed into another prime (21221322263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610661116 + 10610661117.

It is an arithmetic number, because the mean of its divisors is an integer number (10610661117).

Almost surely, 2^21221322233 is an apocalyptic number.

It is an amenable number.

21221322233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221322233 is an equidigital number, since it uses as much as digits as its factorization.

21221322233 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21221322233 its reverse (33222312212), we get a palindrome (54443634445).

The spelling of 21221322233 in words is "twenty-one billion, two hundred twenty-one million, three hundred twenty-two thousand, two hundred thirty-three".