21093704 has 8 divisors (see below), whose sum is σ = 39550710. Its totient is φ = 10546848.

The previous prime is 21093697. The next prime is 21093707. The reversal of 21093704 is 40739012.

It can be written as a sum of positive squares in only one way, i.e., 19377604 + 1716100 = 4402^2 + 1310^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21093707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1318349 + ... + 1318364.

Almost surely, 2^21093704 is an apocalyptic number.

It is an amenable number.

21093704 is a deficient number, since it is larger than the sum of its proper divisors (18457006).

21093704 is a wasteful number, since it uses less digits than its factorization.

21093704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2636719 (or 2636715 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 21093704 is about 4592.7882598700. The cubic root of 21093704 is about 276.3021615499.

The spelling of 21093704 in words is "twenty-one million, ninety-three thousand, seven hundred four".