21037708 has 6 divisors (see below), whose sum is σ = 36815996. Its totient is φ = 10518852.

The previous prime is 21037703. The next prime is 21037727. The reversal of 21037708 is 80773012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21037703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2629710 + ... + 2629717.

Almost surely, 2^21037708 is an apocalyptic number.

It is an amenable number.

21037708 is a deficient number, since it is larger than the sum of its proper divisors (15778288).

21037708 is a wasteful number, since it uses less digits than its factorization.

21037708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5259431 (or 5259429 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 21037708 is about 4586.6881297947. The cubic root of 21037708 is about 276.0574514583.

The spelling of 21037708 in words is "twenty-one million, thirty-seven thousand, seven hundred eight".