21852856 has 8 divisors (see below), whose sum is σ = 40974120. Its totient is φ = 10926424.

The previous prime is 21852851. The next prime is 21852881. The reversal of 21852856 is 65825812.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21852851) by changing a digit.

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 as a sum of consecutive naturals, namely, 1365796 + ... + 1365811.

It is an arithmetic number, because the mean of its divisors is an integer number (5121765).

Almost surely, 2^21852856 is an apocalyptic number.

It is an amenable number.

21852856 is a deficient number, since it is larger than the sum of its proper divisors (19121264).

21852856 is a wasteful number, since it uses less digits than its factorization.

21852856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2731613 (or 2731609 counting only the distinct ones).

The product of its digits is 38400, while the sum is 37.

The square root of 21852856 is about 4674.7038408866. The cubic root of 21852856 is about 279.5778331905.

It can be divided in two parts, 2185 and 2856, that added together give a square (5041 = 71²).

The spelling of 21852856 in words is "twenty-one million, eight hundred fifty-two thousand, eight hundred fifty-six".