21396184 has 8 divisors (see below), whose sum is σ = 40117860. Its totient is φ = 10698088.

The previous prime is 21396161. The next prime is 21396203. The reversal of 21396184 is 48169312.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1337254 + ... + 1337269.

Almost surely, 2^21396184 is an apocalyptic number.

It is an amenable number.

21396184 is a deficient number, since it is larger than the sum of its proper divisors (18721676).

21396184 is a wasteful number, since it uses less digits than its factorization.

21396184 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2674529 (or 2674525 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

The square root of 21396184 is about 4625.6009339328. The cubic root of 21396184 is about 277.6166065691.

The spelling of 21396184 in words is "twenty-one million, three hundred ninety-six thousand, one hundred eighty-four".