21368700 has 54 divisors (see below), whose sum is σ = 66981824. Its totient is φ = 5698080.

The previous prime is 21368651. The next prime is 21368707. The reversal of 21368700 is 786312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21368707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10972 + ... + 12771.

Almost surely, 2^21368700 is an apocalyptic number.

21368700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21368700 is an abundant number, since it is smaller than the sum of its proper divisors (45613124).

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

21368700 is a wasteful number, since it uses less digits than its factorization.

21368700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23763 (or 23753 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 21368700 is about 4622.6291220473. The cubic root of 21368700 is about 277.4976868568.

The spelling of 21368700 in words is "twenty-one million, three hundred sixty-eight thousand, seven hundred".