21796169 has 2 divisors, whose sum is σ = 21796170. Its totient is φ = 21796168.

The previous prime is 21796163. The next prime is 21796171. The reversal of 21796169 is 96169712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21270544 + 525625 = 4612^2 + 725^2 .

It is a cyclic number.

It is not a de Polignac number, because 21796169 - 2¹² = 21792073 is a prime.

It is a super-2 number, since 2×21796169² = 950145966153122, which contains 22 as substring.

Together with 21796171, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21796163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10898084 + 10898085.

It is an arithmetic number, because the mean of its divisors is an integer number (10898085).

Almost surely, 2^21796169 is an apocalyptic number.

It is an amenable number.

21796169 is a deficient number, since it is larger than the sum of its proper divisors (1).

21796169 is an equidigital number, since it uses as much as digits as its factorization.

21796169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 41.

The square root of 21796169 is about 4668.6367389207. The cubic root of 21796169 is about 279.3358792755.

The spelling of 21796169 in words is "twenty-one million, seven hundred ninety-six thousand, one hundred sixty-nine".