8461355221 has 4 divisors (see below), whose sum is σ = 9230569344. Its totient is φ = 7692141100.

The previous prime is 8461355179. The next prime is 8461355257. The reversal of 8461355221 is 1225531648.

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 8461355221 - 2⁹ = 8461354709 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 (8461355261) 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, 384607045 + ... + 384607066.

It is an arithmetic number, because the mean of its divisors is an integer number (2307642336).

Almost surely, 2^8461355221 is an apocalyptic number.

It is an amenable number.

8461355221 is a deficient number, since it is larger than the sum of its proper divisors (769214123).

8461355221 is a wasteful number, since it uses less digits than its factorization.

8461355221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769214122.

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

The square root of 8461355221 is about 91985.6250780523. The cubic root of 8461355221 is about 2037.7300154892.

Adding to 8461355221 its reverse (1225531648), we get a palindrome (9686886869).

The spelling of 8461355221 in words is "eight billion, four hundred sixty-one million, three hundred fifty-five thousand, two hundred twenty-one".