21200102 has 64 divisors (see below), whose sum is σ = 42301440. Its totient is φ = 7728000.

The previous prime is 21200093. The next prime is 21200117. The reversal of 21200102 is 20100212.

It is a self number, because there is not a number n which added to its sum of digits gives 21200102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 209852 + ... + 209952.

It is an arithmetic number, because the mean of its divisors is an integer number (660960).

Almost surely, 2^21200102 is an apocalyptic number.

21200102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21200102 is a deficient number, since it is larger than the sum of its proper divisors (21101338).

21200102 is a wasteful number, since it uses less digits than its factorization.

21200102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 21200102 is about 4604.3568497674. The cubic root of 21200102 is about 276.7659445974.

Adding to 21200102 its reverse (20100212), we get a palindrome (41300314).

The spelling of 21200102 in words is "twenty-one million, two hundred thousand, one hundred two".