13221207652 has 12 divisors (see below), whose sum is σ = 23153269356. Its totient is φ = 6605987840.

The previous prime is 13221207631. The next prime is 13221207689. The reversal of 13221207652 is 25670212231.

It can be written as a sum of positive squares in 2 ways, for example, as 4869806656 + 8351400996 = 69784^2 + 91386^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1147549 + ... + 1159012.

It is an arithmetic number, because the mean of its divisors is an integer number (1929439113).

Almost surely, 2^13221207652 is an apocalyptic number.

It is an amenable number.

13221207652 is a deficient number, since it is larger than the sum of its proper divisors (9932061704).

13221207652 is a wasteful number, since it uses less digits than its factorization.

13221207652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2307998 (or 2307996 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

Adding to 13221207652 its reverse (25670212231), we get a palindrome (38891419883).

The spelling of 13221207652 in words is "thirteen billion, two hundred twenty-one million, two hundred seven thousand, six hundred fifty-two".