1002021109978 has 32 divisors (see below), whose sum is σ = 1821831264000. Its totient is φ = 403501772544.

The previous prime is 1002021109877. The next prime is 1002021109993. The reversal of 1002021109978 is 8799011202001.

It is a self number, because there is not a number n which added to its sum of digits gives 1002021109978.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3371773 + ... + 3656896.

It is an arithmetic number, because the mean of its divisors is an integer number (56932227000).

Almost surely, 2^{1002021109978} is an apocalyptic number.

1002021109978 is a deficient number, since it is larger than the sum of its proper divisors (819810154022).

1002021109978 is a wasteful number, since it uses less digits than its factorization.

1002021109978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7029294.

The product of its (nonzero) digits is 18144, while the sum is 40.

The spelling of 1002021109978 in words is "one trillion, two billion, twenty-one million, one hundred nine thousand, nine hundred seventy-eight".