21441313 has 4 divisors (see below), whose sum is σ = 22373568. Its totient is φ = 20509060.

The previous prime is 21441289. The next prime is 21441323. The reversal of 21441313 is 31314412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21441313 - 2⁹ = 21440801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21441323) by changing a digit.

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, 466093 + ... + 466138.

It is an arithmetic number, because the mean of its divisors is an integer number (5593392).

Almost surely, 2^21441313 is an apocalyptic number.

21441313 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21441313 is a deficient number, since it is larger than the sum of its proper divisors (932255).

21441313 is an equidigital number, since it uses as much as digits as its factorization.

21441313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932254.

The product of its digits is 288, while the sum is 19.

The square root of 21441313 is about 4630.4765413508. The cubic root of 21441313 is about 277.8116532139.

Adding to 21441313 its reverse (31314412), we get a palindrome (52755725).

The spelling of 21441313 in words is "twenty-one million, four hundred forty-one thousand, three hundred thirteen".