21031345545041 has 16 divisors (see below), whose sum is σ = 23181212001024. Its totient is φ = 18957697484544.

The previous prime is 21031345545017. The next prime is 21031345545053. The reversal of 21031345545041 is 14054554313012.

It is not a de Polignac number, because 21031345545041 - 2¹⁰ = 21031345544017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21031345544986 and 21031345545004.

It is not an unprimeable number, because it can be changed into a prime (21031345547041) 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 15 ways as a sum of consecutive naturals, for example, 1913081 + ... + 6761846.

It is an arithmetic number, because the mean of its divisors is an integer number (1448825750064).

Almost surely, 2^{21031345545041} is an apocalyptic number.

It is an amenable number.

21031345545041 is a deficient number, since it is larger than the sum of its proper divisors (2149866455983).

21031345545041 is a wasteful number, since it uses less digits than its factorization.

21031345545041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8679320.

The product of its (nonzero) digits is 144000, while the sum is 38.

Adding to 21031345545041 its reverse (14054554313012), we get a palindrome (35085899858053).

The spelling of 21031345545041 in words is "twenty-one trillion, thirty-one billion, three hundred forty-five million, five hundred forty-five thousand, forty-one".