19991020221002 has 16 divisors (see below), whose sum is σ = 30648485928960. Its totient is φ = 9775190804688.

The previous prime is 19991020220999. The next prime is 19991020221017. The reversal of 19991020221002 is 20012202019991.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 83019113 + ... + 83259564.

It is an arithmetic number, because the mean of its divisors is an integer number (1915530370560).

Almost surely, 2^{19991020221002} is an apocalyptic number.

19991020221002 is a deficient number, since it is larger than the sum of its proper divisors (10657465707958).

19991020221002 is a wasteful number, since it uses less digits than its factorization.

19991020221002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166280005.

The product of its (nonzero) digits is 11664, while the sum is 38.

The spelling of 19991020221002 in words is "nineteen trillion, nine hundred ninety-one billion, twenty million, two hundred twenty-one thousand, two".