2001022221220 has 48 divisors (see below), whose sum is σ = 4783471314048. Its totient is φ = 696007727360.

The previous prime is 2001022221217. The next prime is 2001022221227. The reversal of 2001022221220 is 221222201002.

It is a junction number, because it is equal to n+sod(n) for n = 2001022221194 and 2001022221203.

It is not an unprimeable number, because it can be changed into a prime (2001022221227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197724409 + ... + 197734528.

It is an arithmetic number, because the mean of its divisors is an integer number (99655652376).

Almost surely, 2^{2001022221220} is an apocalyptic number.

2001022221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001022221220 is an abundant number, since it is smaller than the sum of its proper divisors (2782449092828).

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

2001022221220 is a wasteful number, since it uses less digits than its factorization.

2001022221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395458980 (or 395458978 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 2001022221220 its reverse (221222201002), we get a palindrome (2222244422222).

The spelling of 2001022221220 in words is "two trillion, one billion, twenty-two million, two hundred twenty-one thousand, two hundred twenty".