21316395 has 8 divisors (see below), whose sum is σ = 34106256. Its totient is φ = 11368736.

The previous prime is 21316391. The next prime is 21316397. The reversal of 21316395 is 59361312.

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 21316395 - 2² = 21316391 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21316391) 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 in 7 ways as a sum of consecutive naturals, for example, 710532 + ... + 710561.

It is an arithmetic number, because the mean of its divisors is an integer number (4263282).

Almost surely, 2^21316395 is an apocalyptic number.

21316395 is a deficient number, since it is larger than the sum of its proper divisors (12789861).

21316395 is a wasteful number, since it uses less digits than its factorization.

21316395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1421101.

The product of its digits is 4860, while the sum is 30.

The square root of 21316395 is about 4616.9681610338. The cubic root of 21316395 is about 277.2710879025.

The spelling of 21316395 in words is "twenty-one million, three hundred sixteen thousand, three hundred ninety-five".