21161200 has 30 divisors (see below), whose sum is σ = 50840744. Its totient is φ = 8464320.

The previous prime is 21161191. The next prime is 21161227. The reversal of 21161200 is 216112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26052 + ... + 26851.

Almost surely, 2^21161200 is an apocalyptic number.

21161200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21161200 is an abundant number, since it is smaller than the sum of its proper divisors (29679544).

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

21161200 is a wasteful number, since it uses less digits than its factorization.

21161200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52921 (or 52910 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 21161200 is about 4600.1304329334. The cubic root of 21161200 is about 276.5965532563.

Adding to 21161200 its reverse (216112), we get a palindrome (21377312).

The spelling of 21161200 in words is "twenty-one million, one hundred sixty-one thousand, two hundred".