21010241 has 4 divisors (see below), whose sum is σ = 24011712. Its totient is φ = 18008772.

The previous prime is 21010237. The next prime is 21010259. The reversal of 21010241 is 14201012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21010241 - 2² = 21010237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21010271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1500725 + ... + 1500738.

It is an arithmetic number, because the mean of its divisors is an integer number (6002928).

Almost surely, 2^21010241 is an apocalyptic number.

It is an amenable number.

21010241 is a deficient number, since it is larger than the sum of its proper divisors (3001471).

21010241 is an equidigital number, since it uses as much as digits as its factorization.

21010241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3001470.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 21010241 is about 4583.6929434682. The cubic root of 21010241 is about 275.9372581950.

Adding to 21010241 its reverse (14201012), we get a palindrome (35211253).

The spelling of 21010241 in words is "twenty-one million, ten thousand, two hundred forty-one".