2201021028 has 72 divisors (see below), whose sum is σ = 5875571520. Its totient is φ = 692798400.

The previous prime is 2201021023. The next prime is 2201021051. The reversal of 2201021028 is 8201201022.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 2201021028.

It is not an unprimeable number, because it can be changed into a prime (2201021021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 211753 + ... + 221903.

It is an arithmetic number, because the mean of its divisors is an integer number (81605160).

Almost surely, 2^2201021028 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 2201021028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2937785760).

2201021028 is an abundant number, since it is smaller than the sum of its proper divisors (3674550492).

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

2201021028 is a wasteful number, since it uses less digits than its factorization.

2201021028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10497 (or 10492 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 2201021028 is about 46915.0405307296. The cubic root of 2201021028 is about 1300.7926188064.

The spelling of 2201021028 in words is "two billion, two hundred one million, twenty-one thousand, twenty-eight".