8201353621 has 12 divisors (see below), whose sum is σ = 8408485260. Its totient is φ = 7998513600.

The previous prime is 8201353609. The next prime is 8201353669. The reversal of 8201353621 is 1263531028.

It can be written as a sum of positive squares in 2 ways, for example, as 7703572900 + 497780721 = 87770^2 + 22311^2 .

It is not a de Polignac number, because 8201353621 - 2⁹ = 8201353109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8201350621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 444345 + ... + 462433.

It is an arithmetic number, because the mean of its divisors is an integer number (700707105).

Almost surely, 2^8201353621 is an apocalyptic number.

It is an amenable number.

8201353621 is a deficient number, since it is larger than the sum of its proper divisors (207131639).

8201353621 is a wasteful number, since it uses less digits than its factorization.

8201353621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18324 (or 18257 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 8201353621 is about 90561.3251945884. The cubic root of 8201353621 is about 2016.6406291503.

Adding to 8201353621 its reverse (1263531028), we get a palindrome (9464884649).

The spelling of 8201353621 in words is "eight billion, two hundred one million, three hundred fifty-three thousand, six hundred twenty-one".