21230433 has 48 divisors (see below), whose sum is σ = 38054016. Its totient is φ = 11128320.

The previous prime is 21230431. The next prime is 21230459. The reversal of 21230433 is 33403212.

21230433 is a `hidden beast` number, since 2 + 1 + 230 + 433 = 666.

It is not a de Polignac number, because 21230433 - 2¹ = 21230431 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21230431) 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 47 ways as a sum of consecutive naturals, for example, 45823 + ... + 46283.

It is an arithmetic number, because the mean of its divisors is an integer number (792792).

Almost surely, 2^21230433 is an apocalyptic number.

It is an amenable number.

21230433 is a deficient number, since it is larger than the sum of its proper divisors (16823583).

21230433 is a wasteful number, since it uses less digits than its factorization.

21230433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534 (or 531 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 21230433 is about 4607.6494007248. The cubic root of 21230433 is about 276.8978714416.

Adding to 21230433 its reverse (33403212), we get a palindrome (54633645).

The spelling of 21230433 in words is "twenty-one million, two hundred thirty thousand, four hundred thirty-three".