1022221128 has 64 divisors (see below), whose sum is σ = 2693880000. Its totient is φ = 322348032.

The previous prime is 1022221127. The next prime is 1022221139. The reversal of 1022221128 is 8211222201.

It is not an unprimeable number, because it can be changed into a prime (1022221121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 477276 + ... + 479412.

It is an arithmetic number, because the mean of its divisors is an integer number (42091875).

Almost surely, 2^1022221128 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 1022221128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1346940000).

1022221128 is an abundant number, since it is smaller than the sum of its proper divisors (1671658872).

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

1022221128 is a wasteful number, since it uses less digits than its factorization.

1022221128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3214 (or 3210 counting only the distinct ones).

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

The square root of 1022221128 is about 31972.1930433306. The cubic root of 1022221128 is about 1007.3528458161.

Adding to 1022221128 its reverse (8211222201), we get a palindrome (9233443329).

The spelling of 1022221128 in words is "one billion, twenty-two million, two hundred twenty-one thousand, one hundred twenty-eight".