2001121212220 has 24 divisors (see below), whose sum is σ = 4525612588224. Its totient is φ = 738875524416.

The previous prime is 2001121212191. The next prime is 2001121212247. The reversal of 2001121212220 is 222121211002.

It is a happy number.

It is a super-2 number, since 2×2001121212220² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2001121212194 and 2001121212203.

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, 3848309764 + ... + 3848310283.

It is an arithmetic number, because the mean of its divisors is an integer number (188567191176).

Almost surely, 2^{2001121212220} is an apocalyptic number.

2001121212220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001121212220 is an abundant number, since it is smaller than the sum of its proper divisors (2524491376004).

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

2001121212220 is a wasteful number, since it uses less digits than its factorization.

2001121212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7696620069 (or 7696620067 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2001121212220 its reverse (222121211002), we get a palindrome (2223242423222).

The spelling of 2001121212220 in words is "two trillion, one billion, one hundred twenty-one million, two hundred twelve thousand, two hundred twenty".