21034440041 has 4 divisors (see below), whose sum is σ = 21035165184. Its totient is φ = 21033714900.

The previous prime is 21034439963. The next prime is 21034440059. The reversal of 21034440041 is 14004443012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21034440041 - 2¹⁸ = 21034177897 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21034439989 and 21034440016.

It is not an unprimeable number, because it can be changed into a prime (21034440061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317165 + ... + 377706.

It is an arithmetic number, because the mean of its divisors is an integer number (5258791296).

Almost surely, 2^21034440041 is an apocalyptic number.

It is an amenable number.

21034440041 is a deficient number, since it is larger than the sum of its proper divisors (725143).

21034440041 is an equidigital number, since it uses as much as digits as its factorization.

21034440041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725142.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21034440041 its reverse (14004443012), we get a palindrome (35038883053).

The spelling of 21034440041 in words is "twenty-one billion, thirty-four million, four hundred forty thousand, forty-one".