6513221322 has 72 divisors (see below), whose sum is σ = 15017733900. Its totient is φ = 2039712768.

The previous prime is 6513221321. The next prime is 6513221359. The reversal of 6513221322 is 2231223156.

It is a happy number.

6513221322 is a `hidden beast` number, since 651 + 3 + 2 + 2 + 1 + 3 + 2 + 2 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 1535777721 + 4977443601 = 39189^2 + 70551^2 .

It is not an unprimeable number, because it can be changed into a prime (6513221321) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5768454 + ... + 5769582.

Almost surely, 2^6513221322 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6513221322, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7508866950).

6513221322 is an abundant number, since it is smaller than the sum of its proper divisors (8504512578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6513221322 is a wasteful number, since it uses less digits than its factorization.

6513221322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2280 (or 2260 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 6513221322 is about 80704.5309880430. The cubic root of 6513221322 is about 1867.5200735465.

Adding to 6513221322 its reverse (2231223156), we get a palindrome (8744444478).

The spelling of 6513221322 in words is "six billion, five hundred thirteen million, two hundred twenty-one thousand, three hundred twenty-two".