21446871 has 16 divisors (see below), whose sum is σ = 29073408. Its totient is φ = 14061600.

The previous prime is 21446869. The next prime is 21446881. The reversal of 21446871 is 17864412.

It is not a de Polignac number, because 21446871 - 2¹ = 21446869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21446881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68806 + ... + 69116.

It is an arithmetic number, because the mean of its divisors is an integer number (1817088).

Almost surely, 2^21446871 is an apocalyptic number.

21446871 is a deficient number, since it is larger than the sum of its proper divisors (7626537).

21446871 is a wasteful number, since it uses less digits than its factorization.

21446871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622.

The product of its digits is 10752, while the sum is 33.

The square root of 21446871 is about 4631.0766566750. The cubic root of 21446871 is about 277.8356558448.

The spelling of 21446871 in words is "twenty-one million, four hundred forty-six thousand, eight hundred seventy-one".