21314215 has 32 divisors (see below), whose sum is σ = 29393280. Its totient is φ = 14716416.

The previous prime is 21314207. The next prime is 21314221. The reversal of 21314215 is 51241312.

It is not a de Polignac number, because 21314215 - 2³ = 21314207 is a prime.

It is a super-2 number, since 2×21314215² = 908591522132450, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21314192 and 21314201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79101 + ... + 79369.

It is an arithmetic number, because the mean of its divisors is an integer number (918540).

Almost surely, 2^21314215 is an apocalyptic number.

21314215 is a deficient number, since it is larger than the sum of its proper divisors (8079065).

21314215 is a wasteful number, since it uses less digits than its factorization.

21314215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363.

The product of its digits is 240, while the sum is 19.

The square root of 21314215 is about 4616.7320693322. The cubic root of 21314215 is about 277.2616355290.

Adding to 21314215 its reverse (51241312), we get a palindrome (72555527).

The spelling of 21314215 in words is "twenty-one million, three hundred fourteen thousand, two hundred fifteen".