21327413 has 4 divisors (see below), whose sum is σ = 21470700. Its totient is φ = 21184128.

The previous prime is 21327407. The next prime is 21327451. The reversal of 21327413 is 31472312.

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 743044 + 20584369 = 862^2 + 4537^2 .

It is a cyclic number.

It is not a de Polignac number, because 21327413 - 2⁸ = 21327157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21327013) 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, 71420 + ... + 71717.

It is an arithmetic number, because the mean of its divisors is an integer number (5367675).

Almost surely, 2^21327413 is an apocalyptic number.

It is an amenable number.

21327413 is a deficient number, since it is larger than the sum of its proper divisors (143287).

21327413 is a wasteful number, since it uses less digits than its factorization.

21327413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143286.

The product of its digits is 1008, while the sum is 23.

The square root of 21327413 is about 4618.1612141631. The cubic root of 21327413 is about 277.3188515549.

Adding to 21327413 its reverse (31472312), we get a palindrome (52799725).

The spelling of 21327413 in words is "twenty-one million, three hundred twenty-seven thousand, four hundred thirteen".