21416343 has 16 divisors (see below), whose sum is σ = 31061856. Its totient is φ = 13046400.

The previous prime is 21416341. The next prime is 21416383. The reversal of 21416343 is 34361412.

It is not a de Polignac number, because 21416343 - 2¹ = 21416341 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21416341) 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 15 ways as a sum of consecutive naturals, for example, 1221 + ... + 6657.

It is an arithmetic number, because the mean of its divisors is an integer number (1941366).

Almost surely, 2^21416343 is an apocalyptic number.

21416343 is a deficient number, since it is larger than the sum of its proper divisors (9645513).

21416343 is a wasteful number, since it uses less digits than its factorization.

21416343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5554.

The product of its digits is 1728, while the sum is 24.

The square root of 21416343 is about 4627.7794891287. The cubic root of 21416343 is about 277.7037672277.

Adding to 21416343 its reverse (34361412), we get a palindrome (55777755).

The spelling of 21416343 in words is "twenty-one million, four hundred sixteen thousand, three hundred forty-three".