21026708 has 12 divisors (see below), whose sum is σ = 36892212. Its totient is φ = 10486080.

The previous prime is 21026689. The next prime is 21026717. The reversal of 21026708 is 80762012.

It can be written as a sum of positive squares in 2 ways, for example, as 18679684 + 2347024 = 4322^2 + 1532^2 .

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 in 3 ways as a sum of consecutive naturals, for example, 5033 + ... + 8208.

It is an arithmetic number, because the mean of its divisors is an integer number (3074351).

Almost surely, 2^21026708 is an apocalyptic number.

It is an amenable number.

21026708 is a deficient number, since it is larger than the sum of its proper divisors (15865504).

21026708 is a wasteful number, since it uses less digits than its factorization.

21026708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13642 (or 13640 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 21026708 is about 4585.4888507116. The cubic root of 21026708 is about 276.0093289572.

The spelling of 21026708 in words is "twenty-one million, twenty-six thousand, seven hundred eight".