21241205 has 8 divisors (see below), whose sum is σ = 25552800. Its totient is φ = 16950736.

The previous prime is 21241163. The next prime is 21241217. The reversal of 21241205 is 50214212.

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

It is a cyclic number.

It is not a de Polignac number, because 21241205 - 2¹⁴ = 21224821 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2975 + ... + 7164.

It is an arithmetic number, because the mean of its divisors is an integer number (3194100).

Almost surely, 2^21241205 is an apocalyptic number.

It is an amenable number.

21241205 is a deficient number, since it is larger than the sum of its proper divisors (4311595).

21241205 is a wasteful number, since it uses less digits than its factorization.

21241205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10563.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21241205 is about 4608.8181782318. The cubic root of 21241205 is about 276.9446947847.

Adding to 21241205 its reverse (50214212), we get a palindrome (71455417).

The spelling of 21241205 in words is "twenty-one million, two hundred forty-one thousand, two hundred five".