21200502 has 16 divisors (see below), whose sum is σ = 42517440. Its totient is φ = 7047432.

The previous prime is 21200467. The next prime is 21200507. The reversal of 21200502 is 20500212.

It is a super-2 number, since 2×21200502² = 898922570104008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2388 + ... + 6935.

It is an arithmetic number, because the mean of its divisors is an integer number (2657340).

Almost surely, 2^21200502 is an apocalyptic number.

21200502 is an abundant number, since it is smaller than the sum of its proper divisors (21316938).

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

21200502 is a wasteful number, since it uses less digits than its factorization.

21200502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9707.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 21200502 is about 4604.4002866823. The cubic root of 21200502 is about 276.7676852444.

Adding to 21200502 its reverse (20500212), we get a palindrome (41700714).

The spelling of 21200502 in words is "twenty-one million, two hundred thousand, five hundred two".