8185142221 has 4 divisors (see below), whose sum is σ = 8615939200. Its totient is φ = 7754345244.

The previous prime is 8185142219. The next prime is 8185142237. The reversal of 8185142221 is 1222415818.

8185142221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8185142221 - 2¹ = 8185142219 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 (8185142621) 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, 215398461 + ... + 215398498.

It is an arithmetic number, because the mean of its divisors is an integer number (2153984800).

Almost surely, 2^8185142221 is an apocalyptic number.

It is an amenable number.

8185142221 is a deficient number, since it is larger than the sum of its proper divisors (430796979).

8185142221 is a wasteful number, since it uses less digits than its factorization.

8185142221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430796978.

The product of its digits is 10240, while the sum is 34.

The square root of 8185142221 is about 90471.7758253921. The cubic root of 8185142221 is about 2015.3110058572.

The spelling of 8185142221 in words is "eight billion, one hundred eighty-five million, one hundred forty-two thousand, two hundred twenty-one".