8543512221 has 4 divisors (see below), whose sum is σ = 11391349632. Its totient is φ = 5695674812.

The previous prime is 8543512217. The next prime is 8543512223. The reversal of 8543512221 is 1222153458.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8543512221 - 2² = 8543512217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8543512223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1423918701 + ... + 1423918706.

It is an arithmetic number, because the mean of its divisors is an integer number (2847837408).

Almost surely, 2^8543512221 is an apocalyptic number.

It is an amenable number.

8543512221 is a deficient number, since it is larger than the sum of its proper divisors (2847837411).

8543512221 is a wasteful number, since it uses less digits than its factorization.

8543512221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2847837410.

The product of its digits is 19200, while the sum is 33.

The square root of 8543512221 is about 92431.1214959550. The cubic root of 8543512221 is about 2044.3040153655.

Adding to 8543512221 its reverse (1222153458), we get a palindrome (9765665679).

The spelling of 8543512221 in words is "eight billion, five hundred forty-three million, five hundred twelve thousand, two hundred twenty-one".