8284874221 has 4 divisors (see below), whose sum is σ = 8922172252. Its totient is φ = 7647576192.

The previous prime is 8284874219. The next prime is 8284874233. The reversal of 8284874221 is 1224784828.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2042136100 + 6242738121 = 45190^2 + 79011^2 .

It is a cyclic number.

It is not a de Polignac number, because 8284874221 - 2¹ = 8284874219 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 (8284874201) 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, 318648996 + ... + 318649021.

It is an arithmetic number, because the mean of its divisors is an integer number (2230543063).

Almost surely, 2^8284874221 is an apocalyptic number.

It is an amenable number.

8284874221 is a deficient number, since it is larger than the sum of its proper divisors (637298031).

8284874221 is a wasteful number, since it uses less digits than its factorization.

8284874221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637298030.

The product of its digits is 458752, while the sum is 46.

The square root of 8284874221 is about 91021.2844394101. The cubic root of 8284874221 is about 2023.4631815580.

The spelling of 8284874221 in words is "eight billion, two hundred eighty-four million, eight hundred seventy-four thousand, two hundred twenty-one".