21444041401 has 4 divisors (see below), whose sum is σ = 22135784704. Its totient is φ = 20752298100.

The previous prime is 21444041363. The next prime is 21444041413. The reversal of 21444041401 is 10414044412.

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 21444041401 - 2⁷ = 21444041273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21444041471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345871605 + ... + 345871666.

It is an arithmetic number, because the mean of its divisors is an integer number (5533946176).

Almost surely, 2^21444041401 is an apocalyptic number.

It is an amenable number.

21444041401 is a deficient number, since it is larger than the sum of its proper divisors (691743303).

21444041401 is an equidigital number, since it uses as much as digits as its factorization.

21444041401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691743302.

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 21444041401 its reverse (10414044412), we get a palindrome (31858085813).

The spelling of 21444041401 in words is "twenty-one billion, four hundred forty-four million, forty-one thousand, four hundred one".