21448671 has 4 divisors (see below), whose sum is σ = 28598232. Its totient is φ = 14299112.

The previous prime is 21448667. The next prime is 21448711. The reversal of 21448671 is 17684412.

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

It is a cyclic number.

It is not a de Polignac number, because 21448671 - 2² = 21448667 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21448601) 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, 3574776 + ... + 3574781.

It is an arithmetic number, because the mean of its divisors is an integer number (7149558).

Almost surely, 2^21448671 is an apocalyptic number.

21448671 is a deficient number, since it is larger than the sum of its proper divisors (7149561).

21448671 is an equidigital number, since it uses as much as digits as its factorization.

21448671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7149560.

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

The square root of 21448671 is about 4631.2709918553. The cubic root of 21448671 is about 277.8434283880.

The spelling of 21448671 in words is "twenty-one million, four hundred forty-eight thousand, six hundred seventy-one".