21812852 has 12 divisors (see below), whose sum is σ = 38266116. Its totient is φ = 10879680.

The previous prime is 21812837. The next prime is 21812863. The reversal of 21812852 is 25821812.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 781456 + 21031396 = 884^2 + 4586^2 .

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4793 + ... + 8160.

It is an arithmetic number, because the mean of its divisors is an integer number (3188843).

Almost surely, 2^21812852 is an apocalyptic number.

It is an amenable number.

21812852 is a deficient number, since it is larger than the sum of its proper divisors (16453264).

21812852 is a wasteful number, since it uses less digits than its factorization.

21812852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13378 (or 13376 counting only the distinct ones).

The product of its digits is 2560, while the sum is 29.

The square root of 21812852 is about 4670.4231071713. The cubic root of 21812852 is about 279.4071299006.

The spelling of 21812852 in words is "twenty-one million, eight hundred twelve thousand, eight hundred fifty-two".