13121340015523 has 2 divisors, whose sum is σ = 13121340015524. Its totient is φ = 13121340015522.

The previous prime is 13121340015437. The next prime is 13121340015577. The reversal of 13121340015523 is 32551004312131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13121340015523 - 2¹⁷ = 13121339884451 is a prime.

It is not a weakly prime, because it can be changed into another prime (13121340015023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6560670007761 + 6560670007762.

It is an arithmetic number, because the mean of its divisors is an integer number (6560670007762).

Almost surely, 2^{13121340015523} is an apocalyptic number.

13121340015523 is a deficient number, since it is larger than the sum of its proper divisors (1).

13121340015523 is an equidigital number, since it uses as much as digits as its factorization.

13121340015523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 31.

Adding to 13121340015523 its reverse (32551004312131), we get a palindrome (45672344327654).

The spelling of 13121340015523 in words is "thirteen trillion, one hundred twenty-one billion, three hundred forty million, fifteen thousand, five hundred twenty-three".