21379303 has 8 divisors (see below), whose sum is σ = 23953680. Its totient is φ = 18910080.

The previous prime is 21379301. The next prime is 21379339. The reversal of 21379303 is 30397312.

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

It is a cyclic number.

It is not a de Polignac number, because 21379303 - 2¹ = 21379301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21379301) 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 7 ways as a sum of consecutive naturals, for example, 25858 + ... + 26671.

It is an arithmetic number, because the mean of its divisors is an integer number (2994210).

Almost surely, 2^21379303 is an apocalyptic number.

21379303 is a deficient number, since it is larger than the sum of its proper divisors (2574377).

21379303 is a wasteful number, since it uses less digits than its factorization.

21379303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52577.

The product of its (nonzero) digits is 3402, while the sum is 28.

The square root of 21379303 is about 4623.7758379921. The cubic root of 21379303 is about 277.5435767402.

Subtracting 21379303 from its reverse (30397312), we obtain a square (9018009 = 3003²).

The spelling of 21379303 in words is "twenty-one million, three hundred seventy-nine thousand, three hundred three".