2001121023120 has 80 divisors (see below), whose sum is σ = 6568385489280. Its totient is φ = 502242138112.

The previous prime is 2001121023101. The next prime is 2001121023169. The reversal of 2001121023120 is 213201211002.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 2001121023120.

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, 245231340 + ... + 245239499.

It is an arithmetic number, because the mean of its divisors is an integer number (82104818616).

Almost surely, 2^{2001121023120} is an apocalyptic number.

2001121023120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001121023120 is an abundant number, since it is smaller than the sum of its proper divisors (4567264466160).

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

2001121023120 is a wasteful number, since it uses less digits than its factorization.

2001121023120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490470872 (or 490470866 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 2001121023120 its reverse (213201211002), we get a palindrome (2214322234122).

The spelling of 2001121023120 in words is "two trillion, one billion, one hundred twenty-one million, twenty-three thousand, one hundred twenty".