21301343 has 4 divisors (see below), whose sum is σ = 24344400. Its totient is φ = 18258288.

The previous prime is 21301339. The next prime is 21301361. The reversal of 21301343 is 34310312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21301343 - 2² = 21301339 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 (21301363) 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, 1521518 + ... + 1521531.

It is an arithmetic number, because the mean of its divisors is an integer number (6086100).

Almost surely, 2^21301343 is an apocalyptic number.

21301343 is a deficient number, since it is larger than the sum of its proper divisors (3043057).

21301343 is an equidigital number, since it uses as much as digits as its factorization.

21301343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3043056.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 21301343 is about 4615.3377991215. The cubic root of 21301343 is about 277.2058100239.

Adding to 21301343 its reverse (34310312), we get a palindrome (55611655).

The spelling of 21301343 in words is "twenty-one million, three hundred one thousand, three hundred forty-three".