2001022011220 has 12 divisors (see below), whose sum is σ = 4202146223604. Its totient is φ = 800408804480.

The previous prime is 2001022011103. The next prime is 2001022011277. The reversal of 2001022011220 is 221102201002.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 664792361104 + 1336229650116 = 815348^2 + 1155954^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2001022011220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50025550261 + ... + 50025550300.

It is an arithmetic number, because the mean of its divisors is an integer number (350178851967).

Almost surely, 2^{2001022011220} is an apocalyptic number.

2001022011220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001022011220 is an abundant number, since it is smaller than the sum of its proper divisors (2201124212384).

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

2001022011220 is a wasteful number, since it uses less digits than its factorization.

2001022011220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100051100570 (or 100051100568 counting only the distinct ones).

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

Adding to 2001022011220 its reverse (221102201002), we get a palindrome (2222124212222).

The spelling of 2001022011220 in words is "two trillion, one billion, twenty-two million, eleven thousand, two hundred twenty".