21434041 has 4 divisors (see below), whose sum is σ = 21727732. Its totient is φ = 21140352.

The previous prime is 21434029. The next prime is 21434047. The reversal of 21434041 is 14043412.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11799225 + 9634816 = 3435^2 + 3104^2 .

It is a cyclic number.

It is not a de Polignac number, because 21434041 - 2¹⁹ = 20909753 is a prime.

It is a super-2 number, since 2×21434041² = 918836227179362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21434047) 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, 146736 + ... + 146881.

It is an arithmetic number, because the mean of its divisors is an integer number (5431933).

Almost surely, 2^21434041 is an apocalyptic number.

It is an amenable number.

21434041 is a deficient number, since it is larger than the sum of its proper divisors (293691).

21434041 is an equidigital number, since it uses as much as digits as its factorization.

21434041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293690.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 21434041 is about 4629.6912424048. The cubic root of 21434041 is about 277.7802422833.

Adding to 21434041 its reverse (14043412), we get a palindrome (35477453).

The spelling of 21434041 in words is "twenty-one million, four hundred thirty-four thousand, forty-one".