21204014 has 8 divisors (see below), whose sum is σ = 34252680. Its totient is φ = 9786456.

The previous prime is 21204013. The next prime is 21204037. The reversal of 21204014 is 41040212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21204014² = 899220419424392, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21204014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204013) 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 3 ways as a sum of consecutive naturals, for example, 407744 + ... + 407795.

It is an arithmetic number, because the mean of its divisors is an integer number (4281585).

Almost surely, 2^21204014 is an apocalyptic number.

21204014 is a deficient number, since it is larger than the sum of its proper divisors (13048666).

21204014 is a wasteful number, since it uses less digits than its factorization.

21204014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815554.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 21204014 is about 4604.7816452032. The cubic root of 21204014 is about 276.7829671851.

Adding to 21204014 its reverse (41040212), we get a palindrome (62244226).

The spelling of 21204014 in words is "twenty-one million, two hundred four thousand, fourteen".