21412043 has 4 divisors (see below), whose sum is σ = 21422688. Its totient is φ = 21401400.

The previous prime is 21412033. The next prime is 21412049. The reversal of 21412043 is 34021412.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21412043 - 2⁸ = 21411787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21412049) 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, 1283 + ... + 6668.

It is an arithmetic number, because the mean of its divisors is an integer number (5355672).

Almost surely, 2^21412043 is an apocalyptic number.

21412043 is a deficient number, since it is larger than the sum of its proper divisors (10645).

21412043 is an equidigital number, since it uses as much as digits as its factorization.

21412043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10644.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21412043 is about 4627.3148801438. The cubic root of 21412043 is about 277.6851800810.

Adding to 21412043 its reverse (34021412), we get a palindrome (55433455).

The spelling of 21412043 in words is "twenty-one million, four hundred twelve thousand, forty-three".