13854256921 has 2 divisors, whose sum is σ = 13854256922. Its totient is φ = 13854256920.

The previous prime is 13854256919. The next prime is 13854256943. The reversal of 13854256921 is 12965245831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9393486400 + 4460770521 = 96920^2 + 66789^2 .

It is a cyclic number.

It is not a de Polignac number, because 13854256921 - 2¹ = 13854256919 is a prime.

Together with 13854256919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13854256121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6927128460 + 6927128461.

It is an arithmetic number, because the mean of its divisors is an integer number (6927128461).

Almost surely, 2^13854256921 is an apocalyptic number.

It is an amenable number.

13854256921 is a deficient number, since it is larger than the sum of its proper divisors (1).

13854256921 is an equidigital number, since it uses as much as digits as its factorization.

13854256921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 46.

The spelling of 13854256921 in words is "thirteen billion, eight hundred fifty-four million, two hundred fifty-six thousand, nine hundred twenty-one".