21048379 has 4 divisors (see below), whose sum is σ = 22961880. Its totient is φ = 19134880.

The previous prime is 21048373. The next prime is 21048407. The reversal of 21048379 is 97384012.

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

It is a cyclic number.

It is not a de Polignac number, because 21048379 - 2¹¹ = 21046331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21048373) 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, 956734 + ... + 956755.

It is an arithmetic number, because the mean of its divisors is an integer number (5740470).

Almost surely, 2^21048379 is an apocalyptic number.

21048379 is a deficient number, since it is larger than the sum of its proper divisors (1913501).

21048379 is a wasteful number, since it uses less digits than its factorization.

21048379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1913500.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 21048379 is about 4587.8512399597. The cubic root of 21048379 is about 276.1041186322.

The spelling of 21048379 in words is "twenty-one million, forty-eight thousand, three hundred seventy-nine".