21080200 has 24 divisors (see below), whose sum is σ = 49011930. Its totient is φ = 8432000.

The previous prime is 21080173. The next prime is 21080201. The reversal of 21080200 is 208012.

21080200 is nontrivially palindromic in base 9.

It can be written as a sum of positive squares in 3 ways, for example, as 8076964 + 13003236 = 2842^2 + 3606^2 .

It is not an unprimeable number, because it can be changed into a prime (21080201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52501 + ... + 52900.

Almost surely, 2^21080200 is an apocalyptic number.

21080200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21080200 is an abundant number, since it is smaller than the sum of its proper divisors (27931730).

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

21080200 is a wasteful number, since it uses less digits than its factorization.

21080200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105417 (or 105408 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 21080200 is about 4591.3178935900. The cubic root of 21080200 is about 276.2431869084.

Adding to 21080200 its reverse (208012), we get a palindrome (21288212).

The spelling of 21080200 in words is "twenty-one million, eighty thousand, two hundred".