21037336 has 8 divisors (see below), whose sum is σ = 39445020. Its totient is φ = 10518664.

The previous prime is 21037301. The next prime is 21037339. The reversal of 21037336 is 63373012.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21037336.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21037339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1314826 + ... + 1314841.

Almost surely, 2^21037336 is an apocalyptic number.

It is an amenable number.

21037336 is a deficient number, since it is larger than the sum of its proper divisors (18407684).

21037336 is a wasteful number, since it uses less digits than its factorization.

21037336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2629673 (or 2629669 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 25.

The square root of 21037336 is about 4586.6475774797. The cubic root of 21037336 is about 276.0558243169.

The spelling of 21037336 in words is "twenty-one million, thirty-seven thousand, three hundred thirty-six".