21433206 has 16 divisors (see below), whose sum is σ = 43086384. Its totient is φ = 7107744.

The previous prime is 21433163. The next prime is 21433207. The reversal of 21433206 is 60233412.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433207) 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 7 ways as a sum of consecutive naturals, for example, 7885 + ... + 10248.

It is an arithmetic number, because the mean of its divisors is an integer number (2692899).

Almost surely, 2^21433206 is an apocalyptic number.

21433206 is an abundant number, since it is smaller than the sum of its proper divisors (21653178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21433206 is a wasteful number, since it uses less digits than its factorization.

21433206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18335.

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

The square root of 21433206 is about 4629.6010627267. The cubic root of 21433206 is about 277.7766351005.

Adding to 21433206 its reverse (60233412), we get a palindrome (81666618).

The spelling of 21433206 in words is "twenty-one million, four hundred thirty-three thousand, two hundred six".