21676700 has 72 divisors (see below), whose sum is σ = 51184224. Its totient is φ = 7936000.

The previous prime is 21676691. The next prime is 21676703. The reversal of 21676700 is 767612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21676703) 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 23 ways as a sum of consecutive naturals, for example, 69545 + ... + 69855.

It is an arithmetic number, because the mean of its divisors is an integer number (710892).

Almost surely, 2^21676700 is an apocalyptic number.

21676700 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 21676700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25592112).

21676700 is an abundant number, since it is smaller than the sum of its proper divisors (29507524).

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

21676700 is a wasteful number, since it uses less digits than its factorization.

21676700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383 (or 376 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 21676700 is about 4655.8243094000. The cubic root of 21676700 is about 278.8245793729.

The spelling of 21676700 in words is "twenty-one million, six hundred seventy-six thousand, seven hundred".