1021021128 has 48 divisors (see below), whose sum is σ = 2773302480. Its totient is φ = 339351264.

The previous prime is 1021021123. The next prime is 1021021151. The reversal of 1021021128 is 8211201201.

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 1021021128.

It is not an unprimeable number, because it can be changed into a prime (1021021121) 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 11 ways as a sum of consecutive naturals, for example, 4551 + ... + 45417.

It is an arithmetic number, because the mean of its divisors is an integer number (57777135).

Almost surely, 2^1021021128 is an apocalyptic number.

1021021128 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1021021128 is an abundant number, since it is smaller than the sum of its proper divisors (1752281352).

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

1021021128 is a wasteful number, since it uses less digits than its factorization.

1021021128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41226 (or 41219 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 1021021128 is about 31953.4212252773. The cubic root of 1021021128 is about 1006.9585094999.

Adding to 1021021128 its reverse (8211201201), we get a palindrome (9232222329).

The spelling of 1021021128 in words is "one billion, twenty-one million, twenty-one thousand, one hundred twenty-eight".