21205341 has 16 divisors (see below), whose sum is σ = 33264000. Its totient is φ = 13305024.

The previous prime is 21205313. The next prime is 21205361. The reversal of 21205341 is 14350212.

It is not a de Polignac number, because 21205341 - 2⁷ = 21205213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21205361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22641 + ... + 23558.

It is an arithmetic number, because the mean of its divisors is an integer number (2079000).

Almost surely, 2^21205341 is an apocalyptic number.

It is an amenable number.

21205341 is a deficient number, since it is larger than the sum of its proper divisors (12058659).

21205341 is a wasteful number, since it uses less digits than its factorization.

21205341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46225 (or 46219 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 21205341 is about 4604.9257323001. The cubic root of 21205341 is about 276.7887409871.

Adding to 21205341 its reverse (14350212), we get a palindrome (35555553).

The spelling of 21205341 in words is "twenty-one million, two hundred five thousand, three hundred forty-one".