21068369 has 16 divisors (see below), whose sum is σ = 24729600. Its totient is φ = 17576784.

The previous prime is 21068357. The next prime is 21068417. The reversal of 21068369 is 96386012.

It is a cyclic number.

It is not a de Polignac number, because 21068369 - 2¹² = 21064273 is a prime.

It is a super-2 number, since 2×21068369² = 887752344640322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21068309) 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 in 15 ways as a sum of consecutive naturals, for example, 57224 + ... + 57590.

It is an arithmetic number, because the mean of its divisors is an integer number (1545600).

Almost surely, 2^21068369 is an apocalyptic number.

It is an amenable number.

21068369 is a deficient number, since it is larger than the sum of its proper divisors (3661231).

21068369 is a wasteful number, since it uses less digits than its factorization.

21068369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 21068369 is about 4590.0293027387. The cubic root of 21068369 is about 276.1914978866.

The spelling of 21068369 in words is "twenty-one million, sixty-eight thousand, three hundred sixty-nine".