8535641221 has 8 divisors (see below), whose sum is σ = 8566671960. Its totient is φ = 8504636928.

The previous prime is 8535641207. The next prime is 8535641237. The reversal of 8535641221 is 1221465358.

It can be written as a sum of positive squares in 4 ways, for example, as 3193493121 + 5342148100 = 56511^2 + 73090^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8535641221 - 2⁹ = 8535640709 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 (8535611221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 824445 + ... + 834733.

It is an arithmetic number, because the mean of its divisors is an integer number (1070833995).

Almost surely, 2^8535641221 is an apocalyptic number.

It is an amenable number.

8535641221 is a deficient number, since it is larger than the sum of its proper divisors (31030739).

8535641221 is a wasteful number, since it uses less digits than its factorization.

8535641221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13223.

The product of its digits is 57600, while the sum is 37.

The square root of 8535641221 is about 92388.5340342621. The cubic root of 8535641221 is about 2043.6760277029.

The spelling of 8535641221 in words is "eight billion, five hundred thirty-five million, six hundred forty-one thousand, two hundred twenty-one".