1011221128 has 16 divisors (see below), whose sum is σ = 1978476480. Its totient is φ = 483627408.

The previous prime is 1011221111. The next prime is 1011221129. The reversal of 1011221128 is 8211221101.

It is not an unprimeable number, because it can be changed into a prime (1011221129) 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, 2747700 + ... + 2748067.

It is an arithmetic number, because the mean of its divisors is an integer number (123654780).

Almost surely, 2^1011221128 is an apocalyptic number.

It is an amenable number.

1011221128 is a deficient number, since it is larger than the sum of its proper divisors (967255352).

1011221128 is a wasteful number, since it uses less digits than its factorization.

1011221128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5495796 (or 5495792 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

The square root of 1011221128 is about 31799.7032690558. The cubic root of 1011221128 is about 1003.7264721559.

Adding to 1011221128 its reverse (8211221101), we get a palindrome (9222442229).

The spelling of 1011221128 in words is "one billion, eleven million, two hundred twenty-one thousand, one hundred twenty-eight".