21124606 has 4 divisors (see below), whose sum is σ = 31686912. Its totient is φ = 10562302.

The previous prime is 21124601. The next prime is 21124619. The reversal of 21124606 is 60642112.

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

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5281150 + ... + 5281153.

It is an arithmetic number, because the mean of its divisors is an integer number (7921728).

Almost surely, 2^21124606 is an apocalyptic number.

21124606 is a deficient number, since it is larger than the sum of its proper divisors (10562306).

21124606 is a wasteful number, since it uses less digits than its factorization.

21124606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10562305.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21124606 is about 4596.1512159632. The cubic root of 21124606 is about 276.4370220640.

Adding to 21124606 its reverse (60642112), we get a palindrome (81766718).

The spelling of 21124606 in words is "twenty-one million, one hundred twenty-four thousand, six hundred six".