21705314 has 4 divisors (see below), whose sum is σ = 32557974. Its totient is φ = 10852656.

The previous prime is 21705289. The next prime is 21705317. The reversal of 21705314 is 41350712.

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., 19404025 + 2301289 = 4405^2 + 1517^2 .

It is a super-2 number, since 2×21705314² = 942241311677192, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21705314.

It is not an unprimeable number, because it can be changed into a prime (21705317) 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, 5426327 + ... + 5426330.

Almost surely, 2^21705314 is an apocalyptic number.

21705314 is a deficient number, since it is larger than the sum of its proper divisors (10852660).

21705314 is a wasteful number, since it uses less digits than its factorization.

21705314 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10852659.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 21705314 is about 4658.8962212095. The cubic root of 21705314 is about 278.9472114855.

The spelling of 21705314 in words is "twenty-one million, seven hundred five thousand, three hundred fourteen".