21152847 has 8 divisors (see below), whose sum is σ = 29430144. Its totient is φ = 13488728.

The previous prime is 21152797. The next prime is 21152849. The reversal of 21152847 is 74825112.

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

It is a cyclic number.

It is not a de Polignac number, because 21152847 - 2⁶ = 21152783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152849) 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, 153213 + ... + 153350.

It is an arithmetic number, because the mean of its divisors is an integer number (3678768).

Almost surely, 2^21152847 is an apocalyptic number.

21152847 is a deficient number, since it is larger than the sum of its proper divisors (8277297).

21152847 is a wasteful number, since it uses less digits than its factorization.

21152847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306589.

The product of its digits is 4480, while the sum is 30.

The square root of 21152847 is about 4599.2224342817. Note that the first 3 decimals coincide. The cubic root of 21152847 is about 276.5601546419.

Adding to 21152847 its reverse (74825112), we get a palindrome (95977959).

It can be divided in two parts, 211528 and 47, that added together give a triangular number (211575 = T₆₅₀).

The spelling of 21152847 in words is "twenty-one million, one hundred fifty-two thousand, eight hundred forty-seven".