2001212220220 has 24 divisors (see below), whose sum is σ = 4218524934624. Its totient is φ = 797441217216.

The previous prime is 2001212220187. The next prime is 2001212220229. The reversal of 2001212220220 is 220222121002.

It is a junction number, because it is equal to n+sod(n) for n = 2001212220194 and 2001212220203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001212220229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190224039 + ... + 190234558.

It is an arithmetic number, because the mean of its divisors is an integer number (175771872276).

Almost surely, 2^{2001212220220} is an apocalyptic number.

2001212220220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001212220220 is an abundant number, since it is smaller than the sum of its proper divisors (2217312714404).

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

2001212220220 is a wasteful number, since it uses less digits than its factorization.

2001212220220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380458869 (or 380458867 counting only the distinct ones).

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

Adding to 2001212220220 its reverse (220222121002), we get a palindrome (2221434341222).

The spelling of 2001212220220 in words is "two trillion, one billion, two hundred twelve million, two hundred twenty thousand, two hundred twenty".