21872852 has 12 divisors (see below), whose sum is σ = 38314080. Its totient is φ = 10925976.

The previous prime is 21872827. The next prime is 21872861. The reversal of 21872852 is 25827812.

It is a super-3 number, since 3×21872852³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3899 + ... + 7677.

It is an arithmetic number, because the mean of its divisors is an integer number (3192840).

Almost surely, 2^21872852 is an apocalyptic number.

It is an amenable number.

21872852 is a deficient number, since it is larger than the sum of its proper divisors (16441228).

21872852 is a wasteful number, since it uses less digits than its factorization.

21872852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5230 (or 5228 counting only the distinct ones).

The product of its digits is 17920, while the sum is 35.

The square root of 21872852 is about 4676.8420969710. The cubic root of 21872852 is about 279.6630811489.

The spelling of 21872852 in words is "twenty-one million, eight hundred seventy-two thousand, eight hundred fifty-two".