21283438 has 8 divisors (see below), whose sum is σ = 34827480. Its totient is φ = 9674280.

The previous prime is 21283417. The next prime is 21283447. The reversal of 21283438 is 83438212.

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

It is a congruent number.

It is an unprimeable number.

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, 483693 + ... + 483736.

It is an arithmetic number, because the mean of its divisors is an integer number (4353435).

Almost surely, 2^21283438 is an apocalyptic number.

21283438 is a deficient number, since it is larger than the sum of its proper divisors (13544042).

21283438 is a wasteful number, since it uses less digits than its factorization.

21283438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 967442.

The product of its digits is 9216, while the sum is 31.

The square root of 21283438 is about 4613.3976633280. The cubic root of 21283438 is about 277.1281191268.

The spelling of 21283438 in words is "twenty-one million, two hundred eighty-three thousand, four hundred thirty-eight".