21067600 has 60 divisors (see below), whose sum is σ = 52278400. Its totient is φ = 8150400.

The previous prime is 21067591. The next prime is 21067603. The reversal of 21067600 is 676012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21067603) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 11551 + ... + 13249.

Almost surely, 2^21067600 is an apocalyptic number.

21067600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21067600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26139200).

21067600 is an abundant number, since it is smaller than the sum of its proper divisors (31210800).

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

21067600 is a wasteful number, since it uses less digits than its factorization.

21067600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1748 (or 1737 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 21067600 is about 4589.9455334459. The cubic root of 21067600 is about 276.1881374960.

The spelling of 21067600 in words is "twenty-one million, sixty-seven thousand, six hundred".