21348283 has 4 divisors (see below), whose sum is σ = 23289048. Its totient is φ = 19407520.

The previous prime is 21348281. The next prime is 21348289. The reversal of 21348283 is 38284312.

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

It is not a de Polignac number, because 21348283 - 2¹ = 21348281 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21348281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 970366 + ... + 970387.

It is an arithmetic number, because the mean of its divisors is an integer number (5822262).

Almost surely, 2^21348283 is an apocalyptic number.

21348283 is a deficient number, since it is larger than the sum of its proper divisors (1940765).

21348283 is a wasteful number, since it uses less digits than its factorization.

21348283 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1940764.

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

The square root of 21348283 is about 4620.4202189844. The cubic root of 21348283 is about 277.4092791128.

The spelling of 21348283 in words is "twenty-one million, three hundred forty-eight thousand, two hundred eighty-three".