13068868477921 has 3 divisors (see below), whose sum is σ = 13068872093011. Its totient is φ = 13068864862832.

The previous prime is 13068868477877. The next prime is 13068868477943. The reversal of 13068868477921 is 12977486886031.

The square root of 13068868477921 is 3615089.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 8927480676321 + 4141387801600 = 2987889^2 + 2035040^2 .

It is not a de Polignac number, because 13068868477921 - 2³³ = 13060278543329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13068868477961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1807545 + ... + 5422633.

Almost surely, 2^{13068868477921} is an apocalyptic number.

13068868477921 is the 3615089-th square number.

13068868477921 is the 1807545-th centered octagonal number.

It is an amenable number.

13068868477921 is a deficient number, since it is larger than the sum of its proper divisors (3615090).

13068868477921 is an frugal number, since it uses more digits than its factorization.

13068868477921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7230178 (or 3615089 counting only the distinct ones).

The product of its (nonzero) digits is 195084288, while the sum is 70.

The spelling of 13068868477921 in words is "thirteen trillion, sixty-eight billion, eight hundred sixty-eight million, four hundred seventy-seven thousand, nine hundred twenty-one".