21466540 has 24 divisors (see below), whose sum is σ = 45530352. Its totient is φ = 8500800.

The previous prime is 21466519. The next prime is 21466541. The reversal of 21466540 is 4566412.

It is a junction number, because it is equal to n+sod(n) for n = 21466499 and 21466508.

It is not an unprimeable number, because it can be changed into a prime (21466541) 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 7 ways as a sum of consecutive naturals, for example, 3294 + ... + 7333.

It is an arithmetic number, because the mean of its divisors is an integer number (1897098).

Almost surely, 2^21466540 is an apocalyptic number.

21466540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21466540 is an abundant number, since it is smaller than the sum of its proper divisors (24063812).

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

21466540 is a wasteful number, since it uses less digits than its factorization.

21466540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10737 (or 10735 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 21466540 is about 4633.1997582664. The cubic root of 21466540 is about 277.9205645756.

The spelling of 21466540 in words is "twenty-one million, four hundred sixty-six thousand, five hundred forty".