21152841 has 4 divisors (see below), whose sum is σ = 28203792. Its totient is φ = 14101892.

The previous prime is 21152797. The next prime is 21152849. The reversal of 21152841 is 14825112.

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 21152841 - 2⁷ = 21152713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21152849) 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, 3525471 + ... + 3525476.

It is an arithmetic number, because the mean of its divisors is an integer number (7050948).

Almost surely, 2^21152841 is an apocalyptic number.

It is an amenable number.

21152841 is a deficient number, since it is larger than the sum of its proper divisors (7050951).

21152841 is an equidigital number, since it uses as much as digits as its factorization.

21152841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7050950.

The product of its digits is 640, while the sum is 24.

The square root of 21152841 is about 4599.2217819975. The cubic root of 21152841 is about 276.5601284932.

Adding to 21152841 its reverse (14825112), we get a palindrome (35977953).

The spelling of 21152841 in words is "twenty-one million, one hundred fifty-two thousand, eight hundred forty-one".