21452873 has 4 divisors (see below), whose sum is σ = 23103108. Its totient is φ = 19802640.

The previous prime is 21452867. The next prime is 21452887. The reversal of 21452873 is 37825412.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4700224 + 16752649 = 2168^2 + 4093^2 .

It is not a de Polignac number, because 21452873 - 2⁴ = 21452857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21452773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 825098 + ... + 825123.

It is an arithmetic number, because the mean of its divisors is an integer number (5775777).

Almost surely, 2^21452873 is an apocalyptic number.

It is an amenable number.

21452873 is a deficient number, since it is larger than the sum of its proper divisors (1650235).

21452873 is a wasteful number, since it uses less digits than its factorization.

21452873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1650234.

The product of its digits is 13440, while the sum is 32.

The square root of 21452873 is about 4631.7246248023. The cubic root of 21452873 is about 277.8615712658.

The spelling of 21452873 in words is "twenty-one million, four hundred fifty-two thousand, eight hundred seventy-three".