21105367 has 2 divisors, whose sum is σ = 21105368. Its totient is φ = 21105366.

The previous prime is 21105361. The next prime is 21105391. The reversal of 21105367 is 76350112.

21105367 is nontrivially palindromic in base 12.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21105367 - 2⁷ = 21105239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21105361) 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, 10552683 + 10552684.

It is an arithmetic number, because the mean of its divisors is an integer number (10552684).

Almost surely, 2^21105367 is an apocalyptic number.

21105367 is a deficient number, since it is larger than the sum of its proper divisors (1).

21105367 is an equidigital number, since it uses as much as digits as its factorization.

21105367 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 21105367 is about 4594.0577924097. The cubic root of 21105367 is about 276.3530759266.

Adding to 21105367 its reverse (76350112), we get a palindrome (97455479).

The spelling of 21105367 in words is "twenty-one million, one hundred five thousand, three hundred sixty-seven".