21205014 has 16 divisors (see below), whose sum is σ = 42518640. Its totient is φ = 7050240.

The previous prime is 21204949. The next prime is 21205021. The reversal of 21205014 is 41050212.

It is a junction number, because it is equal to n+sod(n) for n = 21204984 and 21205002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1867 + ... + 6774.

It is an arithmetic number, because the mean of its divisors is an integer number (2657415).

Almost surely, 2^21205014 is an apocalyptic number.

21205014 is an abundant number, since it is smaller than the sum of its proper divisors (21313626).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21205014 is a wasteful number, since it uses less digits than its factorization.

21205014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9055.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 21205014 is about 4604.8902267046. The cubic root of 21205014 is about 276.7873182263.

Adding to 21205014 its reverse (41050212), we get a palindrome (62255226).

The spelling of 21205014 in words is "twenty-one million, two hundred five thousand, fourteen".