21086004 has 24 divisors (see below), whose sum is σ = 50531488. Its totient is φ = 6838560.

The previous prime is 21086003. The next prime is 21086011. The reversal of 21086004 is 40068012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21086003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23302 + ... + 24189.

Almost surely, 2^21086004 is an apocalyptic number.

It is an amenable number.

21086004 is an abundant number, since it is smaller than the sum of its proper divisors (29445484).

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

21086004 is a wasteful number, since it uses less digits than its factorization.

21086004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47535 (or 47533 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 21086004 is about 4591.9499126188. The cubic root of 21086004 is about 276.2685372108.

The spelling of 21086004 in words is "twenty-one million, eighty-six thousand, four".