21221133317 has 2 divisors, whose sum is σ = 21221133318. Its totient is φ = 21221133316.

The previous prime is 21221133301. The next prime is 21221133319. The reversal of 21221133317 is 71333112212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20330767396 + 890365921 = 142586^2 + 29839^2 .

It is a cyclic number.

It is not a de Polignac number, because 21221133317 - 2⁴ = 21221133301 is a prime.

Together with 21221133319, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221133319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610566658 + 10610566659.

It is an arithmetic number, because the mean of its divisors is an integer number (10610566659).

Almost surely, 2^21221133317 is an apocalyptic number.

It is an amenable number.

21221133317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221133317 is an equidigital number, since it uses as much as digits as its factorization.

21221133317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 26.

Adding to 21221133317 its reverse (71333112212), we get a palindrome (92554245529).

The spelling of 21221133317 in words is "twenty-one billion, two hundred twenty-one million, one hundred thirty-three thousand, three hundred seventeen".