19991220002 has 16 divisors (see below), whose sum is σ = 32295846912. Its totient is φ = 9226049040.

The previous prime is 19991220001. The next prime is 19991220013. The reversal of 19991220002 is 20002219991.

It is not an unprimeable number, because it can be changed into a prime (19991220001) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 647153 + ... + 677339.

It is an arithmetic number, because the mean of its divisors is an integer number (2018490432).

Almost surely, 2^19991220002 is an apocalyptic number.

19991220002 is a deficient number, since it is larger than the sum of its proper divisors (12304626910).

19991220002 is a wasteful number, since it uses less digits than its factorization.

19991220002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55673.

The product of its (nonzero) digits is 5832, while the sum is 35.

Adding to 19991220002 its reverse (20002219991), we get a palindrome (39993439993).

The spelling of 19991220002 in words is "nineteen billion, nine hundred ninety-one million, two hundred twenty thousand, two".