21340134121241 has 4 divisors (see below), whose sum is σ = 22981682899812. Its totient is φ = 19698585342672.

The previous prime is 21340134121129. The next prime is 21340134121351. The reversal of 21340134121241 is 14212143104312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1054082089225 + 20286052032016 = 1026685^2 + 4504004^2 .

It is a cyclic number.

It is not a de Polignac number, because 21340134121241 - 2¹⁸ = 21340133859097 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21340134121541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 820774389266 + ... + 820774389291.

It is an arithmetic number, because the mean of its divisors is an integer number (5745420724953).

Almost surely, 2^{21340134121241} is an apocalyptic number.

It is an amenable number.

21340134121241 is a deficient number, since it is larger than the sum of its proper divisors (1641548778571).

21340134121241 is a wasteful number, since it uses less digits than its factorization.

21340134121241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1641548778570.

The product of its (nonzero) digits is 4608, while the sum is 29.

Adding to 21340134121241 its reverse (14212143104312), we get a palindrome (35552277225553).

The spelling of 21340134121241 in words is "twenty-one trillion, three hundred forty billion, one hundred thirty-four million, one hundred twenty-one thousand, two hundred forty-one".