21338708 has 6 divisors (see below), whose sum is σ = 37342746. Its totient is φ = 10669352.

The previous prime is 21338683. The next prime is 21338717. The reversal of 21338708 is 80783312.

It can be written as a sum of positive squares in only one way, i.e., 20232004 + 1106704 = 4498^2 + 1052^2 .

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 as a sum of consecutive naturals, namely, 2667335 + ... + 2667342.

It is an arithmetic number, because the mean of its divisors is an integer number (6223791).

Almost surely, 2^21338708 is an apocalyptic number.

It is an amenable number.

21338708 is a deficient number, since it is larger than the sum of its proper divisors (16004038).

21338708 is a wasteful number, since it uses less digits than its factorization.

21338708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5334681 (or 5334679 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 21338708 is about 4619.3839416095. The cubic root of 21338708 is about 277.3677989454.

The spelling of 21338708 in words is "twenty-one million, three hundred thirty-eight thousand, seven hundred eight".