21683804 has 6 divisors (see below), whose sum is σ = 37946664. Its totient is φ = 10841900.

The previous prime is 21683803. The next prime is 21683839. The reversal of 21683804 is 40838612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21683801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2710472 + ... + 2710479.

It is an arithmetic number, because the mean of its divisors is an integer number (6324444).

Almost surely, 2^21683804 is an apocalyptic number.

It is an amenable number.

21683804 is a deficient number, since it is larger than the sum of its proper divisors (16262860).

21683804 is a wasteful number, since it uses less digits than its factorization.

21683804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5420955 (or 5420953 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 21683804 is about 4656.5871622896. The cubic root of 21683804 is about 278.8550353228.

The spelling of 21683804 in words is "twenty-one million, six hundred eighty-three thousand, eight hundred four".