21853882 has 4 divisors (see below), whose sum is σ = 32780826. Its totient is φ = 10926940.

The previous prime is 21853831. The next prime is 21853889. The reversal of 21853882 is 28835812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20875761 + 978121 = 4569^2 + 989^2 .

It is not an unprimeable number, because it can be changed into a prime (21853889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5463469 + ... + 5463472.

Almost surely, 2^21853882 is an apocalyptic number.

21853882 is a deficient number, since it is larger than the sum of its proper divisors (10926944).

21853882 is a wasteful number, since it uses less digits than its factorization.

21853882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10926943.

The product of its digits is 30720, while the sum is 37.

The square root of 21853882 is about 4674.8135791708. The cubic root of 21853882 is about 279.5822085509.

The spelling of 21853882 in words is "twenty-one million, eight hundred fifty-three thousand, eight hundred eighty-two".