21846005 has 4 divisors (see below), whose sum is σ = 26215212. Its totient is φ = 17476800.

The previous prime is 21845983. The next prime is 21846031. The reversal of 21846005 is 50064812.

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 14485636 + 7360369 = 3806^2 + 2713^2 .

It is not a de Polignac number, because 21846005 - 2¹² = 21841909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2184596 + ... + 2184605.

It is an arithmetic number, because the mean of its divisors is an integer number (6553803).

Almost surely, 2^21846005 is an apocalyptic number.

It is an amenable number.

21846005 is a deficient number, since it is larger than the sum of its proper divisors (4369207).

21846005 is an equidigital number, since it uses as much as digits as its factorization.

21846005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4369206.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 21846005 is about 4673.9710097518. The cubic root of 21846005 is about 279.5486137003.

The spelling of 21846005 in words is "twenty-one million, eight hundred forty-six thousand, five".