21124814 has 8 divisors (see below), whose sum is σ = 31741248. Its totient is φ = 10544400.

The previous prime is 21124811. The next prime is 21124819. The reversal of 21124814 is 41842112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21124814.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7487 + ... + 9914.

It is an arithmetic number, because the mean of its divisors is an integer number (3967656).

Almost surely, 2^21124814 is an apocalyptic number.

21124814 is a deficient number, since it is larger than the sum of its proper divisors (10616434).

21124814 is a wasteful number, since it uses less digits than its factorization.

21124814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18010.

The product of its digits is 512, while the sum is 23.

The square root of 21124814 is about 4596.1738435355. The cubic root of 21124814 is about 276.4379293584.

Adding to 21124814 its reverse (41842112), we get a palindrome (62966926).

The spelling of 21124814 in words is "twenty-one million, one hundred twenty-four thousand, eight hundred fourteen".