21016379 has 8 divisors (see below), whose sum is σ = 21964800. Its totient is φ = 20088936.

The previous prime is 21016309. The next prime is 21016381. The reversal of 21016379 is 97361012.

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 21016379 - 2⁸ = 21016123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21016309) 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, 3179 + ... + 7220.

It is an arithmetic number, because the mean of its divisors is an integer number (2745600).

Almost surely, 2^21016379 is an apocalyptic number.

21016379 is a deficient number, since it is larger than the sum of its proper divisors (948421).

21016379 is a wasteful number, since it uses less digits than its factorization.

21016379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10489.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 21016379 is about 4584.3624420414. The cubic root of 21016379 is about 275.9641266475.

The spelling of 21016379 in words is "twenty-one million, sixteen thousand, three hundred seventy-nine".