21471343 has 4 divisors (see below), whose sum is σ = 21515920. Its totient is φ = 21426768.

The previous prime is 21471341. The next prime is 21471367. The reversal of 21471343 is 34317412.

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 21471343 - 2¹ = 21471341 is a prime.

It is a super-2 number, since 2×21471343² = 922037140447298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21471341) 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, 21558 + ... + 22531.

It is an arithmetic number, because the mean of its divisors is an integer number (5378980).

Almost surely, 2^21471343 is an apocalyptic number.

21471343 is a deficient number, since it is larger than the sum of its proper divisors (44577).

21471343 is an equidigital number, since it uses as much as digits as its factorization.

21471343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44576.

The product of its digits is 2016, while the sum is 25.

The square root of 21471343 is about 4633.7180535721. The cubic root of 21471343 is about 277.9412906750.

Adding to 21471343 its reverse (34317412), we get a palindrome (55788755).

The spelling of 21471343 in words is "twenty-one million, four hundred seventy-one thousand, three hundred forty-three".