13887154121 has 4 divisors (see below), whose sum is σ = 13887412500. Its totient is φ = 13886895744.

The previous prime is 13887154111. The next prime is 13887154129. The reversal of 13887154121 is 12145178831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12145178831 = 109 ⋅111423659.

It can be written as a sum of positive squares in 2 ways, for example, as 6307536400 + 7579617721 = 79420^2 + 87061^2 .

It is a cyclic number.

It is not a de Polignac number, because 13887154121 - 2²² = 13882959817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13887154129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14816 + ... + 167313.

It is an arithmetic number, because the mean of its divisors is an integer number (3471853125).

Almost surely, 2^13887154121 is an apocalyptic number.

It is an amenable number.

13887154121 is a deficient number, since it is larger than the sum of its proper divisors (258379).

13887154121 is an equidigital number, since it uses as much as digits as its factorization.

13887154121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258378.

The product of its digits is 53760, while the sum is 41.

The spelling of 13887154121 in words is "thirteen billion, eight hundred eighty-seven million, one hundred fifty-four thousand, one hundred twenty-one".