21149846 has 8 divisors (see below), whose sum is σ = 31810944. Its totient is φ = 10546200.

The previous prime is 21149839. The next prime is 21149873. The reversal of 21149846 is 64894112.

It is a happy number.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 13430 + ... + 14921.

It is an arithmetic number, because the mean of its divisors is an integer number (3976368).

Almost surely, 2^21149846 is an apocalyptic number.

21149846 is a deficient number, since it is larger than the sum of its proper divisors (10661098).

21149846 is a wasteful number, since it uses less digits than its factorization.

21149846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28726.

The product of its digits is 13824, while the sum is 35.

The square root of 21149846 is about 4598.8961719091. The cubic root of 21149846 is about 276.5470752949.

The spelling of 21149846 in words is "twenty-one million, one hundred forty-nine thousand, eight hundred forty-six".