21001535144041 has 16 divisors (see below), whose sum is σ = 21211829496000. Its totient is φ = 20791568524608.

The previous prime is 21001535144033. The next prime is 21001535144059. The reversal of 21001535144041 is 14044153510012.

It is a cyclic number.

It is not a de Polignac number, because 21001535144041 - 2³ = 21001535144033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21001535143994 and 21001535144012.

It is not an unprimeable number, because it can be changed into a prime (21001535144441) 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 15 ways as a sum of consecutive naturals, for example, 728876551 + ... + 728905363.

It is an arithmetic number, because the mean of its divisors is an integer number (1325739343500).

Almost surely, 2^{21001535144041} is an apocalyptic number.

It is an amenable number.

21001535144041 is a deficient number, since it is larger than the sum of its proper divisors (210294351959).

21001535144041 is a wasteful number, since it uses less digits than its factorization.

21001535144041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34248.

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 21001535144041 its reverse (14044153510012), we get a palindrome (35045688654053).

The spelling of 21001535144041 in words is "twenty-one trillion, one billion, five hundred thirty-five million, one hundred forty-four thousand, forty-one".