21436313 has 4 divisors (see below), whose sum is σ = 22564560. Its totient is φ = 20308068.

The previous prime is 21436301. The next prime is 21436319. The reversal of 21436313 is 31363412.

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 21436313 - 2²² = 17242009 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (21436319) 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, 564095 + ... + 564132.

It is an arithmetic number, because the mean of its divisors is an integer number (5641140).

Almost surely, 2^21436313 is an apocalyptic number.

It is an amenable number.

21436313 is a deficient number, since it is larger than the sum of its proper divisors (1128247).

21436313 is a wasteful number, since it uses less digits than its factorization.

21436313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128246.

The product of its digits is 1296, while the sum is 23.

The square root of 21436313 is about 4629.9366086373. The cubic root of 21436313 is about 277.7900568024.

Adding to 21436313 its reverse (31363412), we get a palindrome (52799725).

The spelling of 21436313 in words is "twenty-one million, four hundred thirty-six thousand, three hundred thirteen".