21727708 has 12 divisors (see below), whose sum is σ = 38155320. Its totient is φ = 10826192.

The previous prime is 21727703. The next prime is 21727711. The reversal of 21727708 is 80772712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21727703) 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 in 3 ways as a sum of consecutive naturals, for example, 8098 + ... + 10441.

It is an arithmetic number, because the mean of its divisors is an integer number (3179610).

Almost surely, 2^21727708 is an apocalyptic number.

It is an amenable number.

21727708 is a deficient number, since it is larger than the sum of its proper divisors (16427612).

21727708 is a wasteful number, since it uses less digits than its factorization.

21727708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18836 (or 18834 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 34.

The square root of 21727708 is about 4661.2989605903. The cubic root of 21727708 is about 279.0431111466.

The spelling of 21727708 in words is "twenty-one million, seven hundred twenty-seven thousand, seven hundred eight".