13851370958021 has 2 divisors, whose sum is σ = 13851370958022. Its totient is φ = 13851370958020.

The previous prime is 13851370958017. The next prime is 13851370958063. The reversal of 13851370958021 is 12085907315831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12514514707396 + 1336856250625 = 3537586^2 + 1156225^2 .

It is a cyclic number.

It is not a de Polignac number, because 13851370958021 - 2² = 13851370958017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13851370958011) 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, 6925685479010 + 6925685479011.

It is an arithmetic number, because the mean of its divisors is an integer number (6925685479011).

Almost surely, 2^{13851370958021} is an apocalyptic number.

It is an amenable number.

13851370958021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13851370958021 is an equidigital number, since it uses as much as digits as its factorization.

13851370958021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1814400, while the sum is 53.

The spelling of 13851370958021 in words is "thirteen trillion, eight hundred fifty-one billion, three hundred seventy million, nine hundred fifty-eight thousand, twenty-one".