21833906 has 8 divisors (see below), whose sum is σ = 32787504. Its totient is φ = 10904740.

The previous prime is 21833891. The next prime is 21833909. The reversal of 21833906 is 60933812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21833909) 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, 3680 + ... + 7563.

It is an arithmetic number, because the mean of its divisors is an integer number (4098438).

Almost surely, 2^21833906 is an apocalyptic number.

21833906 is a deficient number, since it is larger than the sum of its proper divisors (10953598).

21833906 is a wasteful number, since it uses less digits than its factorization.

21833906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12216.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 21833906 is about 4672.6765349209. The cubic root of 21833906 is about 279.4969965851.

The spelling of 21833906 in words is "twenty-one million, eight hundred thirty-three thousand, nine hundred six".