21001432444041 has 32 divisors (see below), whose sum is σ = 33039023669248. Its totient is φ = 11612108963520.

The previous prime is 21001432444019. The next prime is 21001432444081. The reversal of 21001432444041 is 14044423410012.

It is a happy number.

It is not a de Polignac number, because 21001432444041 - 2¹¹ = 21001432441993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001432444081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2574120 + ... + 6973446.

It is an arithmetic number, because the mean of its divisors is an integer number (1032469489664).

Almost surely, 2^{21001432444041} is an apocalyptic number.

21001432444041 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21001432444041 is a deficient number, since it is larger than the sum of its proper divisors (12037591225207).

21001432444041 is a wasteful number, since it uses less digits than its factorization.

21001432444041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4406701.

The product of its (nonzero) digits is 12288, while the sum is 30.

Adding to 21001432444041 its reverse (14044423410012), we get a palindrome (35045855854053).

The spelling of 21001432444041 in words is "twenty-one trillion, one billion, four hundred thirty-two million, four hundred forty-four thousand, forty-one".