21683846 has 4 divisors (see below), whose sum is σ = 32525772. Its totient is φ = 10841922.

The previous prime is 21683843. The next prime is 21683899. The reversal of 21683846 is 64838612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21683843) 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 as a sum of consecutive naturals, namely, 5420960 + ... + 5420963.

It is an arithmetic number, because the mean of its divisors is an integer number (8131443).

Almost surely, 2^21683846 is an apocalyptic number.

21683846 is a deficient number, since it is larger than the sum of its proper divisors (10841926).

21683846 is a wasteful number, since it uses less digits than its factorization.

21683846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10841925.

The product of its digits is 55296, while the sum is 38.

The square root of 21683846 is about 4656.5916720279. The cubic root of 21683846 is about 278.8552153636.

The spelling of 21683846 in words is "twenty-one million, six hundred eighty-three thousand, eight hundred forty-six".