21241606 has 4 divisors (see below), whose sum is σ = 31862412. Its totient is φ = 10620802.

The previous prime is 21241573. The next prime is 21241631. The reversal of 21241606 is 60614212.

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 an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5310400 + ... + 5310403.

It is an arithmetic number, because the mean of its divisors is an integer number (7965603).

Almost surely, 2^21241606 is an apocalyptic number.

21241606 is a deficient number, since it is larger than the sum of its proper divisors (10620806).

21241606 is a wasteful number, since it uses less digits than its factorization.

21241606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10620805.

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

The square root of 21241606 is about 4608.8616815869. The cubic root of 21241606 is about 276.9464375315.

Adding to 21241606 its reverse (60614212), we get a palindrome (81855818).

The spelling of 21241606 in words is "twenty-one million, two hundred forty-one thousand, six hundred six".