21413005 has 4 divisors (see below), whose sum is σ = 25695612. Its totient is φ = 17130400.

The previous prime is 21413003. The next prime is 21413009. The reversal of 21413005 is 50031412.

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 13645636 + 7767369 = 3694^2 + 2787^2 .

It is not a de Polignac number, because 21413005 - 2¹ = 21413003 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21413005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21413003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2141296 + ... + 2141305.

It is an arithmetic number, because the mean of its divisors is an integer number (6423903).

Almost surely, 2^21413005 is an apocalyptic number.

It is an amenable number.

21413005 is a deficient number, since it is larger than the sum of its proper divisors (4282607).

21413005 is an equidigital number, since it uses as much as digits as its factorization.

21413005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4282606.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21413005 is about 4627.4188269488. The cubic root of 21413005 is about 277.6893386308.

Adding to 21413005 its reverse (50031412), we get a palindrome (71444417).

The spelling of 21413005 in words is "twenty-one million, four hundred thirteen thousand, five".