21050441 has 4 divisors (see below), whose sum is σ = 21061584. Its totient is φ = 21039300.

The previous prime is 21050417. The next prime is 21050443. The reversal of 21050441 is 14405012.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21050441 - 2²² = 16856137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21050443) 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, 1955 + ... + 6776.

It is an arithmetic number, because the mean of its divisors is an integer number (5265396).

Almost surely, 2^21050441 is an apocalyptic number.

It is an amenable number.

21050441 is a deficient number, since it is larger than the sum of its proper divisors (11143).

21050441 is an equidigital number, since it uses as much as digits as its factorization.

21050441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11142.

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

The square root of 21050441 is about 4588.0759583948. The cubic root of 21050441 is about 276.1131344983.

Adding to 21050441 its reverse (14405012), we get a palindrome (35455453).

The spelling of 21050441 in words is "twenty-one million, fifty thousand, four hundred forty-one".