2001100221020 has 12 divisors (see below), whose sum is σ = 4202310464184. Its totient is φ = 800440088400.

The previous prime is 2001100221017. The next prime is 2001100221101. The reversal of 2001100221020 is 201220011002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2001100220992 and 2001100221010.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50027505506 + ... + 50027505545.

It is an arithmetic number, because the mean of its divisors is an integer number (350192538682).

Almost surely, 2^{2001100221020} is an apocalyptic number.

2001100221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001100221020 is an abundant number, since it is smaller than the sum of its proper divisors (2201210243164).

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

2001100221020 is a wasteful number, since it uses less digits than its factorization.

2001100221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100055011060 (or 100055011058 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 2001100221020 its reverse (201220011002), we get a palindrome (2202320232022).

The spelling of 2001100221020 in words is "two trillion, one billion, one hundred million, two hundred twenty-one thousand, twenty".