2011001221020 has 48 divisors (see below), whose sum is σ = 6142694640768. Its totient is φ = 487515447360.

The previous prime is 2011001221003. The next prime is 2011001221069. The reversal of 2011001221020 is 201221001102.

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 = 2011001220987 and 2011001221005.

It is a congruent number.

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, 1523485114 + ... + 1523486433.

It is an arithmetic number, because the mean of its divisors is an integer number (127972805016).

Almost surely, 2^{2011001221020} is an apocalyptic number.

2011001221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2011001221020 is an abundant number, since it is smaller than the sum of its proper divisors (4131693419748).

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

2011001221020 is a wasteful number, since it uses less digits than its factorization.

2011001221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3046971570 (or 3046971568 counting only the distinct ones).

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

Adding to 2011001221020 its reverse (201221001102), we get a palindrome (2212222222122).

The spelling of 2011001221020 in words is "two trillion, eleven billion, one million, two hundred twenty-one thousand, twenty".