1021211128 has 32 divisors (see below), whose sum is σ = 2239205760. Its totient is φ = 427482720.

The previous prime is 1021211033. The next prime is 1021211129. The reversal of 1021211128 is 8211121201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021211129) 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 7 ways as a sum of consecutive naturals, for example, 209638 + ... + 214453.

It is an arithmetic number, because the mean of its divisors is an integer number (69975180).

Almost surely, 2^1021211128 is an apocalyptic number.

It is an amenable number.

1021211128 is an abundant number, since it is smaller than the sum of its proper divisors (1217994632).

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

1021211128 is a wasteful number, since it uses less digits than its factorization.

1021211128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424147 (or 424143 counting only the distinct ones).

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

The square root of 1021211128 is about 31956.3941645487. The cubic root of 1021211128 is about 1007.0209666633.

Adding to 1021211128 its reverse (8211121201), we get a palindrome (9232332329).

The spelling of 1021211128 in words is "one billion, twenty-one million, two hundred eleven thousand, one hundred twenty-eight".