1021284811 has 4 divisors (see below), whose sum is σ = 1025744800. Its totient is φ = 1016824824.

The previous prime is 1021284799. The next prime is 1021284829. The reversal of 1021284811 is 1184821201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1021284811 - 2⁵ = 1021284779 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021284811.

It is not an unprimeable number, because it can be changed into a prime (1021284881) 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 3 ways as a sum of consecutive naturals, for example, 2229651 + ... + 2230108.

It is an arithmetic number, because the mean of its divisors is an integer number (256436200).

Almost surely, 2^1021284811 is an apocalyptic number.

1021284811 is a deficient number, since it is larger than the sum of its proper divisors (4459989).

1021284811 is an equidigital number, since it uses as much as digits as its factorization.

1021284811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4459988.

The product of its (nonzero) digits is 1024, while the sum is 28.

The square root of 1021284811 is about 31957.5470116215. The cubic root of 1021284811 is about 1007.0451857953.

The spelling of 1021284811 in words is "one billion, twenty-one million, two hundred eighty-four thousand, eight hundred eleven".