21124306 has 8 divisors (see below), whose sum is σ = 36213120. Its totient is φ = 9053268.

The previous prime is 21124289. The next prime is 21124321. The reversal of 21124306 is 60342112.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 754426 + ... + 754453.

It is an arithmetic number, because the mean of its divisors is an integer number (4526640).

Almost surely, 2^21124306 is an apocalyptic number.

21124306 is a deficient number, since it is larger than the sum of its proper divisors (15088814).

21124306 is a wasteful number, since it uses less digits than its factorization.

21124306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508888.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21124306 is about 4596.1185798454. The cubic root of 21124306 is about 276.4357134557.

Adding to 21124306 its reverse (60342112), we get a palindrome (81466418).

The spelling of 21124306 in words is "twenty-one million, one hundred twenty-four thousand, three hundred six".