2011021120020 has 96 divisors (see below), whose sum is σ = 6147676080000. Its totient is φ = 487129743360.

The previous prime is 2011021120019. The next prime is 2011021120021. The reversal of 2011021120020 is 200211201102.

It is an interprime number because it is at equal distance from previous prime (2011021120019) and next prime (2011021120021).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 2011021119978 and 2011021120005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011021120021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 395437 + ... + 2044116.

It is an arithmetic number, because the mean of its divisors is an integer number (64038292500).

Almost surely, 2^{2011021120020} is an apocalyptic number.

2011021120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2011021120020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3073838040000).

2011021120020 is an abundant number, since it is smaller than the sum of its proper divisors (4136654959980).

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

2011021120020 is a wasteful number, since it uses less digits than its factorization.

2011021120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2440825 (or 2440823 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 2011021120020 its reverse (200211201102), we get a palindrome (2211232321122).

The spelling of 2011021120020 in words is "two trillion, eleven billion, twenty-one million, one hundred twenty thousand, twenty".