21200516 has 12 divisors (see below), whose sum is σ = 37385040. Its totient is φ = 10519080.

The previous prime is 21200507. The next prime is 21200521. The reversal of 21200516 is 61500212.

It is a junction number, because it is equal to n+sod(n) for n = 21200494 and 21200503.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19706 + ... + 20753.

It is an arithmetic number, because the mean of its divisors is an integer number (3115420).

Almost surely, 2^21200516 is an apocalyptic number.

It is an amenable number.

21200516 is a deficient number, since it is larger than the sum of its proper divisors (16184524).

21200516 is a wasteful number, since it uses less digits than its factorization.

21200516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40594 (or 40592 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 21200516 is about 4604.4018069669. The cubic root of 21200516 is about 276.7677461666.

Adding to 21200516 its reverse (61500212), we get a palindrome (82700728).

The spelling of 21200516 in words is "twenty-one million, two hundred thousand, five hundred sixteen".