21107004 has 24 divisors (see below), whose sum is σ = 49467600. Its totient is φ = 7004544.

The previous prime is 21106997. The next prime is 21107017. The reversal of 21107004 is 40070112.

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, 979 + ... + 6570.

It is an arithmetic number, because the mean of its divisors is an integer number (2061150).

Almost surely, 2^21107004 is an apocalyptic number.

It is an amenable number.

21107004 is an abundant number, since it is smaller than the sum of its proper divisors (28360596).

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

21107004 is a wasteful number, since it uses less digits than its factorization.

21107004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7789 (or 7787 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 21107004 is about 4594.2359538883. The cubic root of 21107004 is about 276.3602206857.

Adding to 21107004 its reverse (40070112), we get a palindrome (61177116).

The spelling of 21107004 in words is "twenty-one million, one hundred seven thousand, four".