6641230221 has 12 divisors (see below), whose sum is σ = 9662910972. Its totient is φ = 4395168576.

The previous prime is 6641230171. The next prime is 6641230229. The reversal of 6641230221 is 1220321466.

It can be written as a sum of positive squares in 2 ways, for example, as 5385945321 + 1255284900 = 73389^2 + 35430^2 .

It is not a de Polignac number, because 6641230221 - 2⁷ = 6641230093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6641230229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2691886 + ... + 2694351.

It is an arithmetic number, because the mean of its divisors is an integer number (805242581).

Almost surely, 2^6641230221 is an apocalyptic number.

It is an amenable number.

6641230221 is a deficient number, since it is larger than the sum of its proper divisors (3021680751).

6641230221 is a wasteful number, since it uses less digits than its factorization.

6641230221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5386380 (or 5386377 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 6641230221 is about 81493.7434469665. The cubic root of 6641230221 is about 1879.6753457990.

Adding to 6641230221 its reverse (1220321466), we get a palindrome (7861551687).

The spelling of 6641230221 in words is "six billion, six hundred forty-one million, two hundred thirty thousand, two hundred twenty-one".