21433147 has 4 divisors (see below), whose sum is σ = 21837600. Its totient is φ = 21028696.

The previous prime is 21433133. The next prime is 21433151. The reversal of 21433147 is 74133412.

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

It is a cyclic number.

It is not a de Polignac number, because 21433147 - 2¹¹ = 21431099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21433127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202147 + ... + 202252.

It is an arithmetic number, because the mean of its divisors is an integer number (5459400).

Almost surely, 2^21433147 is an apocalyptic number.

21433147 is a deficient number, since it is larger than the sum of its proper divisors (404453).

21433147 is an equidigital number, since it uses as much as digits as its factorization.

21433147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404452.

The product of its digits is 2016, while the sum is 25.

The square root of 21433147 is about 4629.5946906830. The cubic root of 21433147 is about 277.7763802182.

Adding to 21433147 its reverse (74133412), we get a palindrome (95566559).

The spelling of 21433147 in words is "twenty-one million, four hundred thirty-three thousand, one hundred forty-seven".