2001221120120 has 32 divisors (see below), whose sum is σ = 4502815351920. Its totient is φ = 800476389120.

The previous prime is 2001221120077. The next prime is 2001221120141. The reversal of 2001221120120 is 210211221002.

It is a super-2 number, since 2×2001221120120² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2001221120095 and 2001221120104.

It is a congruent number.

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, 2602379 + ... + 3282501.

Almost surely, 2^{2001221120120} is an apocalyptic number.

2001221120120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001221120120 is an abundant number, since it is smaller than the sum of its proper divisors (2501594231800).

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

2001221120120 is a wasteful number, since it uses less digits than its factorization.

2001221120120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753695 (or 753691 counting only the distinct ones).

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

Adding to 2001221120120 its reverse (210211221002), we get a palindrome (2211432341122).

The spelling of 2001221120120 in words is "two trillion, one billion, two hundred twenty-one million, one hundred twenty thousand, one hundred twenty".