1001221020228 has 96 divisors (see below), whose sum is σ = 2789599704192. Its totient is φ = 275470617600.

The previous prime is 1001221020221. The next prime is 1001221020271. The reversal of 1001221020228 is 8220201221001.

It is not an unprimeable number, because it can be changed into a prime (1001221020221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4677801 + ... + 4887152.

It is an arithmetic number, because the mean of its divisors is an integer number (29058330252).

Almost surely, 2^{1001221020228} is an apocalyptic number.

It is an amenable number.

1001221020228 is an abundant number, since it is smaller than the sum of its proper divisors (1788378683964).

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

1001221020228 is a wasteful number, since it uses less digits than its factorization.

1001221020228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9565045 (or 9565043 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 1001221020228 its reverse (8220201221001), we get a palindrome (9221422241229).

The spelling of 1001221020228 in words is "one trillion, one billion, two hundred twenty-one million, twenty thousand, two hundred twenty-eight".