13115304521 has 8 divisors (see below), whose sum is σ = 14308467264. Its totient is φ = 11922285520.

The previous prime is 13115304479. The next prime is 13115304589. The reversal of 13115304521 is 12540351131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13115304521 is a prime.

It is a super-2 number, since 2×13115304521² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13115304221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 263036 + ... + 308898.

It is an arithmetic number, because the mean of its divisors is an integer number (1788558408).

Almost surely, 2^13115304521 is an apocalyptic number.

13115304521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13115304521 is a deficient number, since it is larger than the sum of its proper divisors (1193162743).

13115304521 is a wasteful number, since it uses less digits than its factorization.

13115304521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71871.

The product of its (nonzero) digits is 1800, while the sum is 26.

Adding to 13115304521 its reverse (12540351131), we get a palindrome (25655655652).

The spelling of 13115304521 in words is "thirteen billion, one hundred fifteen million, three hundred four thousand, five hundred twenty-one".