13121315612265 has 32 divisors (see below), whose sum is σ = 23993406938880. Its totient is φ = 5998279682304.

The previous prime is 13121315612261. The next prime is 13121315612303. The reversal of 13121315612265 is 56221651312131.

It is not a de Polignac number, because 13121315612265 - 2² = 13121315612261 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13121315612261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25927671 + ... + 26428899.

It is an arithmetic number, because the mean of its divisors is an integer number (749793966840).

Almost surely, 2^{13121315612265} is an apocalyptic number.

13121315612265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13121315612265 is a deficient number, since it is larger than the sum of its proper divisors (10872091326615).

13121315612265 is a wasteful number, since it uses less digits than its factorization.

13121315612265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750561.

The product of its digits is 64800, while the sum is 39.

Adding to 13121315612265 its reverse (56221651312131), we get a palindrome (69342966924396).

The spelling of 13121315612265 in words is "thirteen trillion, one hundred twenty-one billion, three hundred fifteen million, six hundred twelve thousand, two hundred sixty-five".