21136846 has 8 divisors (see below), whose sum is σ = 31741920. Its totient is φ = 10556208.

The previous prime is 21136837. The next prime is 21136847. The reversal of 21136846 is 64863112.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21136847) 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, 3766 + ... + 7513.

It is an arithmetic number, because the mean of its divisors is an integer number (3967740).

Almost surely, 2^21136846 is an apocalyptic number.

21136846 is a deficient number, since it is larger than the sum of its proper divisors (10605074).

21136846 is a wasteful number, since it uses less digits than its factorization.

21136846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12218.

The product of its digits is 6912, while the sum is 31.

The square root of 21136846 is about 4597.4825720170. The cubic root of 21136846 is about 276.4904027180.

Adding to 21136846 its reverse (64863112), we get a palindrome (85999958).

The spelling of 21136846 in words is "twenty-one million, one hundred thirty-six thousand, eight hundred forty-six".