21144852 has 36 divisors (see below), whose sum is σ = 55176576. Its totient is φ = 6820560.

The previous prime is 21144847. The next prime is 21144859. The reversal of 21144852 is 25844112.

21144852 is a `hidden beast` number, since 211 + 448 + 5 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×21144852² = 894209532203808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144859) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8358 + ... + 10589.

Almost surely, 2^21144852 is an apocalyptic number.

It is an amenable number.

21144852 is an abundant number, since it is smaller than the sum of its proper divisors (34031724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21144852 is a wasteful number, since it uses less digits than its factorization.

21144852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18988 (or 18983 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

The square root of 21144852 is about 4598.3531834778. The cubic root of 21144852 is about 276.5253070543.

Adding to 21144852 its reverse (25844112), we get a palindrome (46988964).

The spelling of 21144852 in words is "twenty-one million, one hundred forty-four thousand, eight hundred fifty-two".