2171008321 has 2 divisors, whose sum is σ = 2171008322. Its totient is φ = 2171008320.

The previous prime is 2171008291. The next prime is 2171008331. The reversal of 2171008321 is 1238001712.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1983455296 + 187553025 = 44536^2 + 13695^2 .

It is a cyclic number.

It is not a de Polignac number, because 2171008321 - 2¹⁵ = 2170975553 is a prime.

It is not a weakly prime, because it can be changed into another prime (2171008331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085504160 + 1085504161.

It is an arithmetic number, because the mean of its divisors is an integer number (1085504161).

Almost surely, 2^2171008321 is an apocalyptic number.

It is an amenable number.

2171008321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171008321 is an equidigital number, since it uses as much as digits as its factorization.

2171008321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 2171008321 is about 46594.0803214314. The cubic root of 2171008321 is about 1294.8530855036.

The spelling of 2171008321 in words is "two billion, one hundred seventy-one million, eight thousand, three hundred twenty-one".