21037038 has 16 divisors (see below), whose sum is σ = 45899136. Its totient is φ = 6374840.

The previous prime is 21037021. The next prime is 21037061. The reversal of 21037038 is 83073012.

It is a junction number, because it is equal to n+sod(n) for n = 21036999 and 21037017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159306 + ... + 159437.

It is an arithmetic number, because the mean of its divisors is an integer number (2868696).

Almost surely, 2^21037038 is an apocalyptic number.

21037038 is an abundant number, since it is smaller than the sum of its proper divisors (24862098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21037038 is a wasteful number, since it uses less digits than its factorization.

21037038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318759.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 21037038 is about 4586.6150917643. The cubic root of 21037038 is about 276.0545208403.

The spelling of 21037038 in words is "twenty-one million, thirty-seven thousand, thirty-eight".