21037004 has 6 divisors (see below), whose sum is σ = 36814764. Its totient is φ = 10518500.

The previous prime is 21036991. The next prime is 21037013. The reversal of 21037004 is 40073012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2629622 + ... + 2629629.

It is an arithmetic number, because the mean of its divisors is an integer number (6135794).

Almost surely, 2^21037004 is an apocalyptic number.

It is an amenable number.

21037004 is a deficient number, since it is larger than the sum of its proper divisors (15777760).

21037004 is a wasteful number, since it uses less digits than its factorization.

21037004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5259255 (or 5259253 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 21037004 is about 4586.6113853258. The cubic root of 21037004 is about 276.0543721207.

The spelling of 21037004 in words is "twenty-one million, thirty-seven thousand, four".