21136600 has 24 divisors (see below), whose sum is σ = 49143060. Its totient is φ = 8454560.

The previous prime is 21136589. The next prime is 21136601. The reversal of 21136600 is 663112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21136601) 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, 52642 + ... + 53041.

Almost surely, 2^21136600 is an apocalyptic number.

21136600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21136600 is an abundant number, since it is smaller than the sum of its proper divisors (28006460).

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

21136600 is a wasteful number, since it uses less digits than its factorization.

21136600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105699 (or 105690 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 21136600 is about 4597.4558181673. The cubic root of 21136600 is about 276.4893300745.

Adding to 21136600 its reverse (663112), we get a palindrome (21799712).

It can be divided in two parts, 21136 and 600, that added together give a triangular number (21736 = T₂₀₈).

The spelling of 21136600 in words is "twenty-one million, one hundred thirty-six thousand, six hundred".