1028323021 has 4 divisors (see below), whose sum is σ = 1121806944. Its totient is φ = 934839100.

The previous prime is 1028323019. The next prime is 1028323039. The reversal of 1028323021 is 1203238201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1028323021 - 2¹ = 1028323019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1028322983 and 1028323001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028327021) 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, 46741945 + ... + 46741966.

It is an arithmetic number, because the mean of its divisors is an integer number (280451736).

Almost surely, 2^1028323021 is an apocalyptic number.

1028323021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1028323021 is a deficient number, since it is larger than the sum of its proper divisors (93483923).

1028323021 is an equidigital number, since it uses as much as digits as its factorization.

1028323021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93483922.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1028323021 is about 32067.4760622036. The cubic root of 1028323021 is about 1009.3532509457.

The spelling of 1028323021 in words is "one billion, twenty-eight million, three hundred twenty-three thousand, twenty-one".