21852727 has 4 divisors (see below), whose sum is σ = 23533720. Its totient is φ = 20171736.

The previous prime is 21852683. The next prime is 21852749. The reversal of 21852727 is 72725812.

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

It is not a de Polignac number, because 21852727 - 2¹¹ = 21850679 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21852692 and 21852701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21852767) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 840477 + ... + 840502.

It is an arithmetic number, because the mean of its divisors is an integer number (5883430).

Almost surely, 2^21852727 is an apocalyptic number.

21852727 is a deficient number, since it is larger than the sum of its proper divisors (1680993).

21852727 is a wasteful number, since it uses less digits than its factorization.

21852727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1680992.

The product of its digits is 15680, while the sum is 34.

The square root of 21852727 is about 4674.6900432007. The cubic root of 21852727 is about 279.5772830623.

The spelling of 21852727 in words is "twenty-one million, eight hundred fifty-two thousand, seven hundred twenty-seven".