2001221010220 has 24 divisors (see below), whose sum is σ = 4385284301664. Its totient is φ = 765684560256.

The previous prime is 2001221010209. The next prime is 2001221010233. The reversal of 2001221010220 is 220101221002.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2001221010220.

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, 2175239769 + ... + 2175240688.

It is an arithmetic number, because the mean of its divisors is an integer number (182720179236).

Almost surely, 2^{2001221010220} is an apocalyptic number.

2001221010220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001221010220 is an abundant number, since it is smaller than the sum of its proper divisors (2384063291444).

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

2001221010220 is a wasteful number, since it uses less digits than its factorization.

2001221010220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4350480489 (or 4350480487 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2001221010220 its reverse (220101221002), we get a palindrome (2221322231222).

The spelling of 2001221010220 in words is "two trillion, one billion, two hundred twenty-one million, ten thousand, two hundred twenty".