2171398692493 has 2 divisors, whose sum is σ = 2171398692494. Its totient is φ = 2171398692492.

The previous prime is 2171398692487. The next prime is 2171398692629. The reversal of 2171398692493 is 3942968931712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1879196822244 + 292201870249 = 1370838^2 + 540557^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2171398692493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2171398692443) 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, 1085699346246 + 1085699346247.

It is an arithmetic number, because the mean of its divisors is an integer number (1085699346247).

Almost surely, 2^{2171398692493} is an apocalyptic number.

It is an amenable number.

2171398692493 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171398692493 is an equidigital number, since it uses as much as digits as its factorization.

2171398692493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35271936, while the sum is 64.

The spelling of 2171398692493 in words is "two trillion, one hundred seventy-one billion, three hundred ninety-eight million, six hundred ninety-two thousand, four hundred ninety-three".