13105212521 has 16 divisors (see below), whose sum is σ = 13903024128. Its totient is φ = 12331310400.

The previous prime is 13105212493. The next prime is 13105212539. The reversal of 13105212521 is 12521250131.

It is a cyclic number.

It is not a de Polignac number, because 13105212521 - 2⁶ = 13105212457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13105212581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2260136 + ... + 2265926.

It is an arithmetic number, because the mean of its divisors is an integer number (868939008).

Almost surely, 2^13105212521 is an apocalyptic number.

It is an amenable number.

13105212521 is a deficient number, since it is larger than the sum of its proper divisors (797811607).

13105212521 is a wasteful number, since it uses less digits than its factorization.

13105212521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7832.

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 13105212521 its reverse (12521250131), we get a palindrome (25626462652).

The spelling of 13105212521 in words is "thirteen billion, one hundred five million, two hundred twelve thousand, five hundred twenty-one".