2001221196018 has 16 divisors (see below), whose sum is σ = 4366300791456. Its totient is φ = 606430665440.

The previous prime is 2001221195999. The next prime is 2001221196019. The reversal of 2001221196018 is 8106911221002.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a self number, because there is not a number n which added to its sum of digits gives 2001221196018.

It is not an unprimeable number, because it can be changed into a prime (2001221196019) by changing a digit.

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, 15160766571 + ... + 15160766702.

It is an arithmetic number, because the mean of its divisors is an integer number (272893799466).

Almost surely, 2^{2001221196018} is an apocalyptic number.

2001221196018 is an abundant number, since it is smaller than the sum of its proper divisors (2365079595438).

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

2001221196018 is a wasteful number, since it uses less digits than its factorization.

2001221196018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30321533289.

The product of its (nonzero) digits is 3456, while the sum is 33.

The spelling of 2001221196018 in words is "two trillion, one billion, two hundred twenty-one million, one hundred ninety-six thousand, eighteen".