1021399116 has 24 divisors (see below), whose sum is σ = 2400664560. Its totient is φ = 337980672.

The previous prime is 1021399103. The next prime is 1021399153. The reversal of 1021399116 is 6119931201.

It is an unprimeable number.

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, 309001 + ... + 312288.

It is an arithmetic number, because the mean of its divisors is an integer number (100027690).

Almost surely, 2^1021399116 is an apocalyptic number.

It is an amenable number.

1021399116 is an abundant number, since it is smaller than the sum of its proper divisors (1379265444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1021399116 is a wasteful number, since it uses less digits than its factorization.

1021399116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621433 (or 621431 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 1021399116 is about 31959.3353497847. The cubic root of 1021399116 is about 1007.0827548145.

The spelling of 1021399116 in words is "one billion, twenty-one million, three hundred ninety-nine thousand, one hundred sixteen".