1021665416 has 16 divisors (see below), whose sum is σ = 2016445200. Its totient is φ = 483946704.

The previous prime is 1021665413. The next prime is 1021665433. The reversal of 1021665416 is 6145661201.

It is not an unprimeable number, because it can be changed into a prime (1021665413) 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, 3360590 + ... + 3360893.

It is an arithmetic number, because the mean of its divisors is an integer number (126027825).

Almost surely, 2^1021665416 is an apocalyptic number.

It is an amenable number.

1021665416 is a deficient number, since it is larger than the sum of its proper divisors (994779784).

1021665416 is a wasteful number, since it uses less digits than its factorization.

1021665416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6721508 (or 6721504 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1021665416 is about 31963.5013100880. The cubic root of 1021665416 is about 1007.1702696848.

The spelling of 1021665416 in words is "one billion, twenty-one million, six hundred sixty-five thousand, four hundred sixteen".