21143852 has 24 divisors (see below), whose sum is σ = 39372480. Its totient is φ = 9900800.

The previous prime is 21143851. The next prime is 21143861. The reversal of 21143852 is 25834112.

It is not an unprimeable number, because it can be changed into a prime (21143851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15602 + ... + 16902.

It is an arithmetic number, because the mean of its divisors is an integer number (1640520).

Almost surely, 2^21143852 is an apocalyptic number.

It is an amenable number.

21143852 is a deficient number, since it is larger than the sum of its proper divisors (18228628).

21143852 is a wasteful number, since it uses less digits than its factorization.

21143852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561 (or 1559 counting only the distinct ones).

The product of its digits is 1920, while the sum is 26.

The square root of 21143852 is about 4598.2444476126. The cubic root of 21143852 is about 276.5209477637.

Adding to 21143852 its reverse (25834112), we get a palindrome (46977964).

The spelling of 21143852 in words is "twenty-one million, one hundred forty-three thousand, eight hundred fifty-two".