21084314 has 4 divisors (see below), whose sum is σ = 31626474. Its totient is φ = 10542156.

The previous prime is 21084313. The next prime is 21084317. The reversal of 21084314 is 41348012.

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

It can be written as a sum of positive squares in only one way, i.e., 15405625 + 5678689 = 3925^2 + 2383^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21084314.

It is not an unprimeable number, because it can be changed into a prime (21084311) 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 as a sum of consecutive naturals, namely, 5271077 + ... + 5271080.

Almost surely, 2^21084314 is an apocalyptic number.

21084314 is a deficient number, since it is larger than the sum of its proper divisors (10542160).

21084314 is a wasteful number, since it uses less digits than its factorization.

21084314 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10542159.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 21084314 is about 4591.7658912449. The cubic root of 21084314 is about 276.2611562279.

The spelling of 21084314 in words is "twenty-one million, eighty-four thousand, three hundred fourteen".