21033269 has 4 divisors (see below), whose sum is σ = 21065196. Its totient is φ = 21001344.

The previous prime is 21033263. The next prime is 21033277. The reversal of 21033269 is 96233012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9891025 + 11142244 = 3145^2 + 3338^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21033269 is a prime.

It is a super-2 number, since 2×21033269² = 884796809652722, 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 (21033263) 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 3 ways as a sum of consecutive naturals, for example, 14954 + ... + 16299.

It is an arithmetic number, because the mean of its divisors is an integer number (5266299).

Almost surely, 2^21033269 is an apocalyptic number.

It is an amenable number.

21033269 is a deficient number, since it is larger than the sum of its proper divisors (31927).

21033269 is an equidigital number, since it uses as much as digits as its factorization.

21033269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31926.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 21033269 is about 4586.2042039142. The cubic root of 21033269 is about 276.0380338610.

The spelling of 21033269 in words is "twenty-one million, thirty-three thousand, two hundred sixty-nine".