21184364 has 6 divisors (see below), whose sum is σ = 37072644.
Its totient is φ = 10592180.
The previous prime is 21184349. The next prime is 21184379. The reversal of 21184364 is 46348112.
It is an interprime number because it is at equal distance from previous prime (21184349) and next prime (21184379).
It is an unprimeable number.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2648042 + ... + 2648049.
It is an arithmetic number, because the mean of its divisors is an integer number (6178774).
Almost surely, 221184364 is an apocalyptic number.
It is an amenable number.
21184364 is a deficient number, since it is larger than the sum of its proper divisors (15888280).
21184364 is a wasteful number, since it uses less digits than its factorization.
21184364 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 5296095 (or 5296093 counting only the distinct ones).
The product of its digits is 4608, while the sum is 29.
The square root of 21184364 is about 4602.6474989945.
The cubic root of 21184364 is about 276.6974414566.
The spelling of 21184364 in words is "twenty-one million, one hundred eighty-four thousand, three hundred sixty-four".