21546066 has 16 divisors (see below), whose sum is σ = 43141824. Its totient is φ = 7173744.

The previous prime is 21546047. The next prime is 21546067. The reversal of 21546066 is 66064512.

It is not an unprimeable number, because it can be changed into a prime (21546067) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5971 + ... + 8873.

It is an arithmetic number, because the mean of its divisors is an integer number (2696364).

Almost surely, 2^21546066 is an apocalyptic number.

21546066 is an abundant number, since it is smaller than the sum of its proper divisors (21595758).

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

21546066 is a wasteful number, since it uses less digits than its factorization.

21546066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4145.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 21546066 is about 4641.7740143182. The cubic root of 21546066 is about 278.2633410326.

The spelling of 21546066 in words is "twenty-one million, five hundred forty-six thousand, sixty-six".