2001220002120 has 128 divisors (see below), whose sum is σ = 6216408115200. Its totient is φ = 514781654016.

The previous prime is 2001220002113. The next prime is 2001220002137. The reversal of 2001220002120 is 212000221002.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 2001220002096 and 2001220002105.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 3518242 + ... + 4047278.

It is an arithmetic number, because the mean of its divisors is an integer number (48565688400).

Almost surely, 2^{2001220002120} is an apocalyptic number.

2001220002120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2001220002120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3108204057600).

2001220002120 is an abundant number, since it is smaller than the sum of its proper divisors (4215188113080).

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

2001220002120 is a wasteful number, since it uses less digits than its factorization.

2001220002120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530167 (or 530163 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 2001220002120 its reverse (212000221002), we get a palindrome (2213220223122).

The spelling of 2001220002120 in words is "two trillion, one billion, two hundred twenty million, two thousand, one hundred twenty".