2185703221 has 4 divisors (see below), whose sum is σ = 2353834252. Its totient is φ = 2017572192.

The previous prime is 2185703189. The next prime is 2185703249. The reversal of 2185703221 is 1223075812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 150430225 + 2035272996 = 12265^2 + 45114^2 .

It is a cyclic number.

It is not a de Polignac number, because 2185703221 - 2⁵ = 2185703189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2185703521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84065496 + ... + 84065521.

It is an arithmetic number, because the mean of its divisors is an integer number (588458563).

Almost surely, 2^2185703221 is an apocalyptic number.

It is an amenable number.

2185703221 is a deficient number, since it is larger than the sum of its proper divisors (168131031).

2185703221 is a wasteful number, since it uses less digits than its factorization.

2185703221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168131030.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 2185703221 is about 46751.5050132079. The cubic root of 2185703221 is about 1297.7680085116.

The spelling of 2185703221 in words is "two billion, one hundred eighty-five million, seven hundred three thousand, two hundred twenty-one".