2171321206 has 16 divisors (see below), whose sum is σ = 3334052304. Its totient is φ = 1059990624.

The previous prime is 2171321183. The next prime is 2171321221. The reversal of 2171321206 is 6021231712.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425140 + ... + 430216.

It is an arithmetic number, because the mean of its divisors is an integer number (208378269).

Almost surely, 2^2171321206 is an apocalyptic number.

2171321206 is a deficient number, since it is larger than the sum of its proper divisors (1162731098).

2171321206 is a wasteful number, since it uses less digits than its factorization.

2171321206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10095.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 2171321206 is about 46597.4377621774. The cubic root of 2171321206 is about 1294.9152871147.

Adding to 2171321206 its reverse (6021231712), we get a palindrome (8192552918).

The spelling of 2171321206 in words is "two billion, one hundred seventy-one million, three hundred twenty-one thousand, two hundred six".