21260543110005 has 16 divisors (see below), whose sum is σ = 34495979808384. Its totient is φ = 11179252714560.

The previous prime is 21260543109977. The next prime is 21260543110007. The reversal of 21260543110005 is 50001134506212.

It is not a de Polignac number, because 21260543110005 - 2⁸ = 21260543109749 is a prime.

It is a super-2 number, since 2×21260543110005² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21260543110007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9981474574 + ... + 9981476703.

It is an arithmetic number, because the mean of its divisors is an integer number (2155998738024).

Almost surely, 2^{21260543110005} is an apocalyptic number.

It is an amenable number.

21260543110005 is a deficient number, since it is larger than the sum of its proper divisors (13235436698379).

21260543110005 is a wasteful number, since it uses less digits than its factorization.

21260543110005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19962951356.

The product of its (nonzero) digits is 7200, while the sum is 30.

Adding to 21260543110005 its reverse (50001134506212), we get a palindrome (71261677616217).

The spelling of 21260543110005 in words is "twenty-one trillion, two hundred sixty billion, five hundred forty-three million, one hundred ten thousand, five".