21052241 has 8 divisors (see below), whose sum is σ = 24619584. Its totient is φ = 17624880.

The previous prime is 21052219. The next prime is 21052243. The reversal of 21052241 is 14225012.

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

It is not a de Polignac number, because 21052241 - 2⁶ = 21052177 is a prime.

It is a super-2 number, since 2×21052241² = 886393702244162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21052243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34670 + ... + 35271.

It is an arithmetic number, because the mean of its divisors is an integer number (3077448).

Almost surely, 2^21052241 is an apocalyptic number.

It is an amenable number.

21052241 is a deficient number, since it is larger than the sum of its proper divisors (3567343).

21052241 is an equidigital number, since it uses as much as digits as its factorization.

21052241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69991.

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

The square root of 21052241 is about 4588.2721148598. The cubic root of 21052241 is about 276.1210043173.

Adding to 21052241 its reverse (14225012), we get a palindrome (35277253).

The spelling of 21052241 in words is "twenty-one million, fifty-two thousand, two hundred forty-one".