2171670220771 has 2 divisors, whose sum is σ = 2171670220772. Its totient is φ = 2171670220770.

The previous prime is 2171670220757. The next prime is 2171670220777. The reversal of 2171670220771 is 1770220761712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2171670220771 - 2²⁹ = 2171133349859 is a prime.

It is not a weakly prime, because it can be changed into another prime (2171670220777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085835110385 + 1085835110386.

It is an arithmetic number, because the mean of its divisors is an integer number (1085835110386).

Almost surely, 2^{2171670220771} is an apocalyptic number.

2171670220771 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171670220771 is an equidigital number, since it uses as much as digits as its factorization.

2171670220771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 115248, while the sum is 43.

The spelling of 2171670220771 in words is "two trillion, one hundred seventy-one billion, six hundred seventy million, two hundred twenty thousand, seven hundred seventy-one".