21134433 has 4 divisors (see below), whose sum is σ = 28179248. Its totient is φ = 14089620.

The previous prime is 21134431. The next prime is 21134453. The reversal of 21134433 is 33443112.

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 not a de Polignac number, because 21134433 - 2¹ = 21134431 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21134431) 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, 3522403 + ... + 3522408.

It is an arithmetic number, because the mean of its divisors is an integer number (7044812).

Almost surely, 2^21134433 is an apocalyptic number.

It is an amenable number.

21134433 is a deficient number, since it is larger than the sum of its proper divisors (7044815).

21134433 is an equidigital number, since it uses as much as digits as its factorization.

21134433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7044814.

The product of its digits is 864, while the sum is 21.

The square root of 21134433 is about 4597.2201383010. The cubic root of 21134433 is about 276.4798808592.

Adding to 21134433 its reverse (33443112), we get a palindrome (54577545).

The spelling of 21134433 in words is "twenty-one million, one hundred thirty-four thousand, four hundred thirty-three".