13876646656921 has 2 divisors, whose sum is σ = 13876646656922. Its totient is φ = 13876646656920.

The previous prime is 13876646656919. The next prime is 13876646656987. The reversal of 13876646656921 is 12965664667831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9339900015625 + 4536746641296 = 3056125^2 + 2129964^2 .

It is a cyclic number.

It is not a de Polignac number, because 13876646656921 - 2¹ = 13876646656919 is a prime.

It is a super-2 number, since 2×13876646656921² (a number of 27 digits) contains 22 as substring.

Together with 13876646656919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13876646656021) 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 as a sum of consecutive naturals, namely, 6938323328460 + 6938323328461.

It is an arithmetic number, because the mean of its divisors is an integer number (6938323328461).

Almost surely, 2^{13876646656921} is an apocalyptic number.

It is an amenable number.

13876646656921 is a deficient number, since it is larger than the sum of its proper divisors (1).

13876646656921 is an equidigital number, since it uses as much as digits as its factorization.

13876646656921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 470292480, while the sum is 70.

The spelling of 13876646656921 in words is "thirteen trillion, eight hundred seventy-six billion, six hundred forty-six million, six hundred fifty-six thousand, nine hundred twenty-one".