21448687 has 8 divisors (see below), whose sum is σ = 23159360. Its totient is φ = 19746720.

The previous prime is 21448667. The next prime is 21448711. The reversal of 21448687 is 78684412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21448687 - 2²³ = 13060079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21448607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3514 + ... + 7432.

It is an arithmetic number, because the mean of its divisors is an integer number (2894920).

Almost surely, 2^21448687 is an apocalyptic number.

21448687 is a deficient number, since it is larger than the sum of its proper divisors (1710673).

21448687 is a wasteful number, since it uses less digits than its factorization.

21448687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4353.

The product of its digits is 86016, while the sum is 40.

The square root of 21448687 is about 4631.2727192425. The cubic root of 21448687 is about 277.8434974753.

The spelling of 21448687 in words is "twenty-one million, four hundred forty-eight thousand, six hundred eighty-seven".