1021315444 has 12 divisors (see below), whose sum is σ = 1787526468. Its totient is φ = 510593600.

The previous prime is 1021315439. The next prime is 1021315447. The reversal of 1021315444 is 4445131201.

It can be written as a sum of positive squares in 2 ways, for example, as 704902500 + 316412944 = 26550^2 + 17788^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021315447) 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 3 ways as a sum of consecutive naturals, for example, 50304 + ... + 67624.

It is an arithmetic number, because the mean of its divisors is an integer number (148960539).

Almost surely, 2^1021315444 is an apocalyptic number.

It is an amenable number.

1021315444 is a deficient number, since it is larger than the sum of its proper divisors (766211024).

1021315444 is a wasteful number, since it uses less digits than its factorization.

1021315444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32066 (or 32064 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 1021315444 is about 31958.0262844876. The cubic root of 1021315444 is about 1007.0552543242.

Adding to 1021315444 its reverse (4445131201), we get a palindrome (5466446645).

The spelling of 1021315444 in words is "one billion, twenty-one million, three hundred fifteen thousand, four hundred forty-four".