2171257211 has 2 divisors, whose sum is σ = 2171257212. Its totient is φ = 2171257210.

The previous prime is 2171257189. The next prime is 2171257223. The reversal of 2171257211 is 1127521712.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2171257211 - 2²² = 2167062907 is a prime.

It is not a weakly prime, because it can be changed into another prime (2171257271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085628605 + 1085628606.

It is an arithmetic number, because the mean of its divisors is an integer number (1085628606).

Almost surely, 2^2171257211 is an apocalyptic number.

2171257211 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171257211 is an equidigital number, since it uses as much as digits as its factorization.

2171257211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1960, while the sum is 29.

The square root of 2171257211 is about 46596.7510777307. The cubic root of 2171257211 is about 1294.9025653799.

Adding to 2171257211 its reverse (1127521712), we get a palindrome (3298778923).

The spelling of 2171257211 in words is "two billion, one hundred seventy-one million, two hundred fifty-seven thousand, two hundred eleven".