2001100211020 has 48 divisors (see below), whose sum is σ = 4320691191936. Its totient is φ = 778035456000.

The previous prime is 2001100211009. The next prime is 2001100211081. The reversal of 2001100211020 is 201120011002.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 2001100210988 and 2001100211006.

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, 4280301 + ... + 4724740.

It is an arithmetic number, because the mean of its divisors is an integer number (90014399832).

Almost surely, 2^{2001100211020} is an apocalyptic number.

2001100211020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001100211020 is an abundant number, since it is smaller than the sum of its proper divisors (2319590980916).

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

2001100211020 is a wasteful number, since it uses less digits than its factorization.

2001100211020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9005362 (or 9005360 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 2001100211020 its reverse (201120011002), we get a palindrome (2202220222022).

The spelling of 2001100211020 in words is "two trillion, one billion, one hundred million, two hundred eleven thousand, twenty".