21050241 has 4 divisors (see below), whose sum is σ = 28066992. Its totient is φ = 14033492.

The previous prime is 21050231. The next prime is 21050251. The reversal of 21050241 is 14205012.

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 an interprime number because it is at equal distance from previous prime (21050231) and next prime (21050251).

It is a cyclic number.

It is not a de Polignac number, because 21050241 - 2⁹ = 21049729 is a prime.

It is a super-2 number, since 2×21050241² = 886225292316162, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21050241.

It is not an unprimeable number, because it can be changed into a prime (21050231) 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, 3508371 + ... + 3508376.

It is an arithmetic number, because the mean of its divisors is an integer number (7016748).

Almost surely, 2^21050241 is an apocalyptic number.

It is an amenable number.

21050241 is a deficient number, since it is larger than the sum of its proper divisors (7016751).

21050241 is an equidigital number, since it uses as much as digits as its factorization.

21050241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7016750.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 21050241 is about 4588.0541627143. The cubic root of 21050241 is about 276.1122600463.

Adding to 21050241 its reverse (14205012), we get a palindrome (35255253).

The spelling of 21050241 in words is "twenty-one million, fifty thousand, two hundred forty-one".