1021438563 has 4 divisors (see below), whose sum is σ = 1361918088. Its totient is φ = 680959040.

The previous prime is 1021438549. The next prime is 1021438597. The reversal of 1021438563 is 3658341201.

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 1021438563 - 2⁴ = 1021438547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1021438063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170239758 + ... + 170239763.

It is an arithmetic number, because the mean of its divisors is an integer number (340479522).

Almost surely, 2^1021438563 is an apocalyptic number.

1021438563 is a deficient number, since it is larger than the sum of its proper divisors (340479525).

1021438563 is an equidigital number, since it uses as much as digits as its factorization.

1021438563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340479524.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 1021438563 is about 31959.9524874490. The cubic root of 1021438563 is about 1007.0957193456.

Adding to 1021438563 its reverse (3658341201), we get a palindrome (4679779764).

The spelling of 1021438563 in words is "one billion, twenty-one million, four hundred thirty-eight thousand, five hundred sixty-three".