13261133512421 has 2 divisors, whose sum is σ = 13261133512422. Its totient is φ = 13261133512420.

The previous prime is 13261133512409. The next prime is 13261133512457. The reversal of 13261133512421 is 12421533116231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10530278111521 + 2730855400900 = 3245039^2 + 1652530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13261133512421 is a prime.

It is a super-2 number, since 2×13261133512421² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13261133512481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6630566756210 + 6630566756211.

It is an arithmetic number, because the mean of its divisors is an integer number (6630566756211).

Almost surely, 2^{13261133512421} is an apocalyptic number.

It is an amenable number.

13261133512421 is a deficient number, since it is larger than the sum of its proper divisors (1).

13261133512421 is an equidigital number, since it uses as much as digits as its factorization.

13261133512421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 35.

Adding to 13261133512421 its reverse (12421533116231), we get a palindrome (25682666628652).

The spelling of 13261133512421 in words is "thirteen trillion, two hundred sixty-one billion, one hundred thirty-three million, five hundred twelve thousand, four hundred twenty-one".