21605314 has 8 divisors (see below), whose sum is σ = 32729148. Its totient is φ = 10695600.

The previous prime is 21605293. The next prime is 21605321. The reversal of 21605314 is 41350612.

It can be written as a sum of positive squares in 2 ways, for example, as 21464689 + 140625 = 4633^2 + 375^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53277 + ... + 53680.

Almost surely, 2^21605314 is an apocalyptic number.

21605314 is a deficient number, since it is larger than the sum of its proper divisors (11123834).

21605314 is a wasteful number, since it uses less digits than its factorization.

21605314 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107060.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 21605314 is about 4648.1516756664. The cubic root of 21605314 is about 278.5181664803.

Adding to 21605314 its reverse (41350612), we get a palindrome (62955926).

The spelling of 21605314 in words is "twenty-one million, six hundred five thousand, three hundred fourteen".