2001002221220 has 48 divisors (see below), whose sum is σ = 4446426700800. Its totient is φ = 754304474880.

The previous prime is 2001002221199. The next prime is 2001002221303. The reversal of 2001002221220 is 221222001002.

It is a junction number, because it is equal to n+sod(n) for n = 2001002221195 and 2001002221204.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13712225 + ... + 13857384.

It is an arithmetic number, because the mean of its divisors is an integer number (92633889600).

Almost surely, 2^{2001002221220} is an apocalyptic number.

2001002221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001002221220 is an abundant number, since it is smaller than the sum of its proper divisors (2445424479580).

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

2001002221220 is a wasteful number, since it uses less digits than its factorization.

2001002221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27569828 (or 27569826 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 2001002221220 its reverse (221222001002), we get a palindrome (2222224222222).

It can be divided in two parts, 2001002 and 221220, that added together give a palindrome (2222222).

The spelling of 2001002221220 in words is "two trillion, one billion, two million, two hundred twenty-one thousand, two hundred twenty".