1021240208 has 20 divisors (see below), whose sum is σ = 1986016860. Its totient is φ = 508719744.

The previous prime is 1021240193. The next prime is 1021240247. The reversal of 1021240208 is 8020421201.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 55771024 + 965469184 = 7468^2 + 31072^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1021240208.

It is an unprimeable number.

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, 114335 + ... + 122942.

It is an arithmetic number, because the mean of its divisors is an integer number (99300843).

Almost surely, 2^1021240208 is an apocalyptic number.

It is an amenable number.

1021240208 is a deficient number, since it is larger than the sum of its proper divisors (964776652).

1021240208 is a wasteful number, since it uses less digits than its factorization.

1021240208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237554 (or 237548 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 1021240208 is about 31956.8491563233. The cubic root of 1021240208 is about 1007.0305252130.

Adding to 1021240208 its reverse (8020421201), we get a palindrome (9041661409).

The spelling of 1021240208 in words is "one billion, twenty-one million, two hundred forty thousand, two hundred eight".