8442621220 has 96 divisors (see below), whose sum is σ = 20342762496. Its totient is φ = 2914828800.

The previous prime is 8442621197. The next prime is 8442621223. The reversal of 8442621220 is 221262448.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (8442621223) 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 31 ways as a sum of consecutive naturals, for example, 349782 + ... + 373138.

It is an arithmetic number, because the mean of its divisors is an integer number (211903776).

Almost surely, 2^8442621220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8442621220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10171381248).

8442621220 is an abundant number, since it is smaller than the sum of its proper divisors (11900141276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8442621220 is a wasteful number, since it uses less digits than its factorization.

8442621220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23461 (or 23459 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 31.

The square root of 8442621220 is about 91883.7375164942. The cubic root of 8442621220 is about 2036.2250144687.

Adding to 8442621220 its reverse (221262448), we get a palindrome (8663883668).

The spelling of 8442621220 in words is "eight billion, four hundred forty-two million, six hundred twenty-one thousand, two hundred twenty".