1021338385 has 8 divisors (see below), whose sum is σ = 1267868520. Its totient is φ = 788895744.

The previous prime is 1021338377. The next prime is 1021338389. The reversal of 1021338385 is 5838331201.

It can be written as a sum of positive squares in 4 ways, for example, as 411643521 + 609694864 = 20289^2 + 24692^2 .

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 1021338385 - 2³ = 1021338377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021338385.

It is not an unprimeable number, because it can be changed into a prime (1021338389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3521712 + ... + 3522001.

It is an arithmetic number, because the mean of its divisors is an integer number (158483565).

Almost surely, 2^1021338385 is an apocalyptic number.

It is an amenable number.

1021338385 is a deficient number, since it is larger than the sum of its proper divisors (246530135).

1021338385 is an equidigital number, since it uses as much as digits as its factorization.

1021338385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7043747.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 1021338385 is about 31958.3852063899. The cubic root of 1021338385 is about 1007.0627944960.

Adding to 1021338385 its reverse (5838331201), we get a palindrome (6859669586).

The spelling of 1021338385 in words is "one billion, twenty-one million, three hundred thirty-eight thousand, three hundred eighty-five".