21315327 has 16 divisors (see below), whose sum is σ = 31101312. Its totient is φ = 12877920.

The previous prime is 21315289. The next prime is 21315341. The reversal of 21315327 is 72351312.

It is not a de Polignac number, because 21315327 - 2¹⁰ = 21314303 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21315297 and 21315306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21314327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12288 + ... + 13914.

It is an arithmetic number, because the mean of its divisors is an integer number (1943832).

Almost surely, 2^21315327 is an apocalyptic number.

21315327 is a deficient number, since it is larger than the sum of its proper divisors (9785985).

21315327 is a wasteful number, since it uses less digits than its factorization.

21315327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2038.

The product of its digits is 1260, while the sum is 24.

The square root of 21315327 is about 4616.8524992683. The cubic root of 21315327 is about 277.2664571872.

Adding to 21315327 its reverse (72351312), we get a palindrome (93666639).

The spelling of 21315327 in words is "twenty-one million, three hundred fifteen thousand, three hundred twenty-seven".