21063269 has 8 divisors (see below), whose sum is σ = 21398520. Its totient is φ = 20730816.

The previous prime is 21063257. The next prime is 21063281. The reversal of 21063269 is 96236012.

It is an interprime number because it is at equal distance from previous prime (21063257) and next prime (21063281).

It can be written as a sum of positive squares in 4 ways, for example, as 3940225 + 17123044 = 1985^2 + 4138^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21063269 - 2⁴ = 21063253 is a prime.

It is a super-2 number, since 2×21063269² = 887322601932722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21063169) 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 7 ways as a sum of consecutive naturals, for example, 18299 + ... + 19415.

It is an arithmetic number, because the mean of its divisors is an integer number (2674815).

Almost surely, 2^21063269 is an apocalyptic number.

It is an amenable number.

21063269 is a deficient number, since it is larger than the sum of its proper divisors (335251).

21063269 is a wasteful number, since it uses less digits than its factorization.

21063269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 21063269 is about 4589.4737171053. The cubic root of 21063269 is about 276.1692102839.

The spelling of 21063269 in words is "twenty-one million, sixty-three thousand, two hundred sixty-nine".