21703379 has 4 divisors (see below), whose sum is σ = 22403520. Its totient is φ = 21003240.

The previous prime is 21703361. The next prime is 21703399. The reversal of 21703379 is 97330712.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21703379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21703399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 350024 + ... + 350085.

It is an arithmetic number, because the mean of its divisors is an integer number (5600880).

Almost surely, 2^21703379 is an apocalyptic number.

21703379 is a deficient number, since it is larger than the sum of its proper divisors (700141).

21703379 is an equidigital number, since it uses as much as digits as its factorization.

21703379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700140.

The product of its (nonzero) digits is 7938, while the sum is 32.

The square root of 21703379 is about 4658.6885493667. The cubic root of 21703379 is about 278.9389219810.

The spelling of 21703379 in words is "twenty-one million, seven hundred three thousand, three hundred seventy-nine".