21505215340041 has 8 divisors (see below), whose sum is σ = 28952005118400. Its totient is φ = 14197617894192.

The previous prime is 21505215340039. The next prime is 21505215340051. The reversal of 21505215340041 is 14004351250512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21505215340041 - 2¹ = 21505215340039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21505215339984 and 21505215340011.

It is not an unprimeable number, because it can be changed into a prime (21505215340051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34798082766 + ... + 34798083383.

It is an arithmetic number, because the mean of its divisors is an integer number (3619000639800).

Almost surely, 2^{21505215340041} is an apocalyptic number.

It is an amenable number.

21505215340041 is a deficient number, since it is larger than the sum of its proper divisors (7446789778359).

21505215340041 is a wasteful number, since it uses less digits than its factorization.

21505215340041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69596166255.

The product of its (nonzero) digits is 24000, while the sum is 33.

Adding to 21505215340041 its reverse (14004351250512), we get a palindrome (35509566590553).

The spelling of 21505215340041 in words is "twenty-one trillion, five hundred five billion, two hundred fifteen million, three hundred forty thousand, forty-one".