1020021305 has 8 divisors (see below), whose sum is σ = 1247120712. Its totient is φ = 800620288.

The previous prime is 1020021283. The next prime is 1020021347. The reversal of 1020021305 is 5031200201.

It is a happy number.

1020021305 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 224160784 + 795860521 = 14972^2 + 28211^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1020021305 - 2²⁴ = 1003244089 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 1020021305.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1924304 + ... + 1924833.

It is an arithmetic number, because the mean of its divisors is an integer number (155890089).

Almost surely, 2^1020021305 is an apocalyptic number.

It is an amenable number.

1020021305 is a deficient number, since it is larger than the sum of its proper divisors (227099407).

1020021305 is an equidigital number, since it uses as much as digits as its factorization.

1020021305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3849195.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 1020021305 is about 31937.7723863140. The cubic root of 1020021305 is about 1006.6297180397.

Adding to 1020021305 its reverse (5031200201), we get a palindrome (6051221506).

The spelling of 1020021305 in words is "one billion, twenty million, twenty-one thousand, three hundred five".