21184342 has 4 divisors (see below), whose sum is σ = 31776516. Its totient is φ = 10592170.

The previous prime is 21184327. The next prime is 21184343. The reversal of 21184342 is 24348112.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21184343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5296084 + ... + 5296087.

It is an arithmetic number, because the mean of its divisors is an integer number (7944129).

Almost surely, 2^21184342 is an apocalyptic number.

21184342 is a deficient number, since it is larger than the sum of its proper divisors (10592174).

21184342 is a wasteful number, since it uses less digits than its factorization.

21184342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10592173.

The product of its digits is 1536, while the sum is 25.

The square root of 21184342 is about 4602.6451090650. The cubic root of 21184342 is about 276.6973456730.

The spelling of 21184342 in words is "twenty-one million, one hundred eighty-four thousand, three hundred forty-two".