2138458072171 has 2 divisors, whose sum is σ = 2138458072172. Its totient is φ = 2138458072170.

The previous prime is 2138458072147. The next prime is 2138458072217. The reversal of 2138458072171 is 1712708548312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2138458072171 is a prime.

It is not a weakly prime, because it can be changed into another prime (2138458072141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069229036085 + 1069229036086.

It is an arithmetic number, because the mean of its divisors is an integer number (1069229036086).

Almost surely, 2^{2138458072171} is an apocalyptic number.

2138458072171 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138458072171 is an equidigital number, since it uses as much as digits as its factorization.

2138458072171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 752640, while the sum is 49.

The spelling of 2138458072171 in words is "two trillion, one hundred thirty-eight billion, four hundred fifty-eight million, seventy-two thousand, one hundred seventy-one".