21340316 has 12 divisors (see below), whose sum is σ = 37449888. Its totient is φ = 10640352.

The previous prime is 21340313. The next prime is 21340327. The reversal of 21340316 is 61304312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21340313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5801 + ... + 8736.

It is an arithmetic number, because the mean of its divisors is an integer number (3120824).

Almost surely, 2^21340316 is an apocalyptic number.

It is an amenable number.

21340316 is a deficient number, since it is larger than the sum of its proper divisors (16109572).

21340316 is a wasteful number, since it uses less digits than its factorization.

21340316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14908 (or 14906 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 21340316 is about 4619.5579875135. The cubic root of 21340316 is about 277.3747658810.

Adding to 21340316 its reverse (61304312), we get a palindrome (82644628).

The spelling of 21340316 in words is "twenty-one million, three hundred forty thousand, three hundred sixteen".