21433669 has 4 divisors (see below), whose sum is σ = 21482496. Its totient is φ = 21384844.

The previous prime is 21433667. The next prime is 21433681. The reversal of 21433669 is 96633412.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21433669 - 2¹ = 21433667 is a prime.

It is a super-2 number, since 2×21433669² = 918804333603122, 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 (21433667) 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, 23749 + ... + 24634.

It is an arithmetic number, because the mean of its divisors is an integer number (5370624).

Almost surely, 2^21433669 is an apocalyptic number.

It is an amenable number.

21433669 is a deficient number, since it is larger than the sum of its proper divisors (48827).

21433669 is an equidigital number, since it uses as much as digits as its factorization.

21433669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48826.

The product of its digits is 23328, while the sum is 34.

The square root of 21433669 is about 4629.6510667652. The cubic root of 21433669 is about 277.7786352625.

The spelling of 21433669 in words is "twenty-one million, four hundred thirty-three thousand, six hundred sixty-nine".