21466500 has 96 divisors (see below), whose sum is σ = 68245632. Its totient is φ = 5200000.

The previous prime is 21466457. The next prime is 21466513. The reversal of 21466500 is 566412.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 15850 + ... + 17150.

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

Almost surely, 2^21466500 is an apocalyptic number.

21466500 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 21466500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34122816).

21466500 is an abundant number, since it is smaller than the sum of its proper divisors (46779132).

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

21466500 is a wasteful number, since it uses less digits than its factorization.

21466500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334 (or 1322 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 21466500 is about 4633.1954415932. The cubic root of 21466500 is about 277.9203919530.

It can be divided in two parts, 2146 and 6500, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 21466500 in words is "twenty-one million, four hundred sixty-six thousand, five hundred".