21048393 has 4 divisors (see below), whose sum is σ = 28064528. Its totient is φ = 14032260.

The previous prime is 21048373. The next prime is 21048407. The reversal of 21048393 is 39384012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21048393 - 2⁵ = 21048361 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21048393.

It is not an unprimeable number, because it can be changed into a prime (21048323) 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, 3508063 + ... + 3508068.

It is an arithmetic number, because the mean of its divisors is an integer number (7016132).

Almost surely, 2^21048393 is an apocalyptic number.

It is an amenable number.

21048393 is a deficient number, since it is larger than the sum of its proper divisors (7016135).

21048393 is an equidigital number, since it uses as much as digits as its factorization.

21048393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7016134.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 21048393 is about 4587.8527657282. The cubic root of 21048393 is about 276.1041798476.

The spelling of 21048393 in words is "twenty-one million, forty-eight thousand, three hundred ninety-three".