21466161 has 16 divisors (see below), whose sum is σ = 32240320. Its totient is φ = 14113440.

The previous prime is 21466157. The next prime is 21466163. The reversal of 21466161 is 16166412.

21466161 is a `hidden beast` number, since 2 + 1 + 46 + 616 + 1 = 666.

It is not a de Polignac number, because 21466161 - 2² = 21466157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21466163) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3475 + ... + 7416.

It is an arithmetic number, because the mean of its divisors is an integer number (2015020).

Almost surely, 2^21466161 is an apocalyptic number.

It is an amenable number.

21466161 is a deficient number, since it is larger than the sum of its proper divisors (10774159).

21466161 is a wasteful number, since it uses less digits than its factorization.

21466161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10973 (or 10967 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 21466161 is about 4633.1588576262. The cubic root of 21466161 is about 277.9189289679.

The spelling of 21466161 in words is "twenty-one million, four hundred sixty-six thousand, one hundred sixty-one".