21208114 has 16 divisors (see below), whose sum is σ = 32605056. Its totient is φ = 10342800.

The previous prime is 21208097. The next prime is 21208127. The reversal of 21208114 is 41180212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21208091 and 21208100.

It is an unprimeable number.

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, 15319 + ... + 16645.

It is an arithmetic number, because the mean of its divisors is an integer number (2037816).

Almost surely, 2^21208114 is an apocalyptic number.

21208114 is a deficient number, since it is larger than the sum of its proper divisors (11396942).

21208114 is a wasteful number, since it uses less digits than its factorization.

21208114 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1521.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 21208114 is about 4605.2268130897. The cubic root of 21208114 is about 276.8008055848.

Adding to 21208114 its reverse (41180212), we get a palindrome (62388326).

The spelling of 21208114 in words is "twenty-one million, two hundred eight thousand, one hundred fourteen".