2001221210120 has 32 divisors (see below), whose sum is σ = 4912088425920. Its totient is φ = 727716803520.

The previous prime is 2001221210089. The next prime is 2001221210143. The reversal of 2001221210120 is 210121221002.

It is a junction number, because it is equal to n+sod(n) for n = 2001221210095 and 2001221210104.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2274114572 + ... + 2274115451.

It is an arithmetic number, because the mean of its divisors is an integer number (153502763310).

Almost surely, 2^{2001221210120} is an apocalyptic number.

2001221210120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001221210120 is an abundant number, since it is smaller than the sum of its proper divisors (2910867215800).

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

2001221210120 is a wasteful number, since it uses less digits than its factorization.

2001221210120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4548230045 (or 4548230041 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2001221210120 its reverse (210121221002), we get a palindrome (2211342431122).

The spelling of 2001221210120 in words is "two trillion, one billion, two hundred twenty-one million, two hundred ten thousand, one hundred twenty".