21066700 has 36 divisors (see below), whose sum is σ = 45934560. Its totient is φ = 8386240.

The previous prime is 21066697. The next prime is 21066707. The reversal of 21066700 is 766012.

It is not an unprimeable number, because it can be changed into a prime (21066707) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28941 + ... + 29659.

It is an arithmetic number, because the mean of its divisors is an integer number (1275960).

Almost surely, 2^21066700 is an apocalyptic number.

21066700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21066700 is an abundant number, since it is smaller than the sum of its proper divisors (24867860).

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

21066700 is a wasteful number, since it uses less digits than its factorization.

21066700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026 (or 1019 counting only the distinct ones).

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

The square root of 21066700 is about 4589.8474920198. The cubic root of 21066700 is about 276.1842045553.

The spelling of 21066700 in words is "twenty-one million, sixty-six thousand, seven hundred".