21448085 has 4 divisors (see below), whose sum is σ = 25737708. Its totient is φ = 17158464.

The previous prime is 21448079. The next prime is 21448127. The reversal of 21448085 is 58084412.

It is a happy number.

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 16957924 + 4490161 = 4118^2 + 2119^2 .

It is a cyclic number.

It is not a de Polignac number, because 21448085 - 2¹⁴ = 21431701 is a prime.

It is a Duffinian number.

It is a Curzon 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, 2144804 + ... + 2144813.

It is an arithmetic number, because the mean of its divisors is an integer number (6434427).

Almost surely, 2^21448085 is an apocalyptic number.

It is an amenable number.

21448085 is a deficient number, since it is larger than the sum of its proper divisors (4289623).

21448085 is an equidigital number, since it uses as much as digits as its factorization.

21448085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4289622.

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 21448085 is about 4631.2077258529. The cubic root of 21448085 is about 277.8408980411.

The spelling of 21448085 in words is "twenty-one million, four hundred forty-eight thousand, eighty-five".