21846065 has 4 divisors (see below), whose sum is σ = 26215284. Its totient is φ = 17476848.

The previous prime is 21846059. The next prime is 21846091. The reversal of 21846065 is 56064812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13278736 + 8567329 = 3644^2 + 2927^2 .

It is a cyclic number.

It is not a de Polignac number, because 21846065 - 2⁸ = 21845809 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 2184602 + ... + 2184611.

It is an arithmetic number, because the mean of its divisors is an integer number (6553821).

Almost surely, 2^21846065 is an apocalyptic number.

It is an amenable number.

21846065 is a deficient number, since it is larger than the sum of its proper divisors (4369219).

21846065 is an equidigital number, since it uses as much as digits as its factorization.

21846065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4369218.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 21846065 is about 4673.9774282724. The cubic root of 21846065 is about 279.5488696266.

The spelling of 21846065 in words is "twenty-one million, eight hundred forty-six thousand, sixty-five".