21441304134361 has 4 divisors (see below), whose sum is σ = 21454730124772. Its totient is φ = 21427878143952.

The previous prime is 21441304134359. The next prime is 21441304134401. The reversal of 21441304134361 is 16343140314412.

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 8254238174361 + 13187065960000 = 2873019^2 + 3631400^2 .

It is a cyclic number.

It is not a de Polignac number, because 21441304134361 - 2¹ = 21441304134359 is a prime.

It is a super-2 number, since 2×21441304134361² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21441304134361.

It is not an unprimeable number, because it can be changed into a prime (21441304134331) 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, 6712992810 + ... + 6712996003.

It is an arithmetic number, because the mean of its divisors is an integer number (5363682531193).

Almost surely, 2^{21441304134361} is an apocalyptic number.

It is an amenable number.

21441304134361 is a deficient number, since it is larger than the sum of its proper divisors (13425990411).

21441304134361 is a wasteful number, since it uses less digits than its factorization.

21441304134361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13425990410.

The product of its (nonzero) digits is 82944, while the sum is 37.

Adding to 21441304134361 its reverse (16343140314412), we get a palindrome (37784444448773).

The spelling of 21441304134361 in words is "twenty-one trillion, four hundred forty-one billion, three hundred four million, one hundred thirty-four thousand, three hundred sixty-one".