21313326627261 has 6 divisors (see below), whose sum is σ = 30785916239390. Its totient is φ = 14208884418168.

The previous prime is 21313326627259. The next prime is 21313326627293. The reversal of 21313326627261 is 16272662331312.

It is a happy number.

21313326627261 is a `hidden beast` number, since 2 + 1 + 3 + 1 + 3 + 326 + 62 + 7 + 261 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20729982014361 + 583344612900 = 4553019^2 + 763770^2 .

It is not a de Polignac number, because 21313326627261 - 2¹ = 21313326627259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313326623261) 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 5 ways as a sum of consecutive naturals, for example, 1184073701506 + ... + 1184073701523.

Almost surely, 2^{21313326627261} is an apocalyptic number.

It is an amenable number.

21313326627261 is a deficient number, since it is larger than the sum of its proper divisors (9472589612129).

21313326627261 is a wasteful number, since it uses less digits than its factorization.

21313326627261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2368147403035 (or 2368147403032 counting only the distinct ones).

The product of its digits is 653184, while the sum is 45.

Adding to 21313326627261 its reverse (16272662331312), we get a palindrome (37585988958573).

The spelling of 21313326627261 in words is "twenty-one trillion, three hundred thirteen billion, three hundred twenty-six million, six hundred twenty-seven thousand, two hundred sixty-one".