21466320 has 40 divisors (see below), whose sum is σ = 66546336. Its totient is φ = 5724288.

The previous prime is 21466297. The next prime is 21466349. The reversal of 21466320 is 2366412.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 44482 + ... + 44961.

Almost surely, 2^21466320 is an apocalyptic number.

21466320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21466320 is an abundant number, since it is smaller than the sum of its proper divisors (45080016).

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

21466320 is a wasteful number, since it uses less digits than its factorization.

21466320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89459 (or 89453 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 21466320 is about 4633.1760165139. The cubic root of 21466320 is about 277.9196151486.

The spelling of 21466320 in words is "twenty-one million, four hundred sixty-six thousand, three hundred twenty".