2001222221020 has 36 divisors (see below), whose sum is σ = 4619350140552. Its totient is φ = 727717170400.

The previous prime is 2001222220999. The next prime is 2001222221021. The reversal of 2001222221020 is 201222221002.

It is a super-3 number, since 3×2001222221020³ (a number of 38 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2001222220985 and 2001222221003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001222221021) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 413473246 + ... + 413478085.

It is an arithmetic number, because the mean of its divisors is an integer number (128315281682).

Almost surely, 2^{2001222221020} is an apocalyptic number.

2001222221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001222221020 is an abundant number, since it is smaller than the sum of its proper divisors (2618127919532).

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

2001222221020 is a wasteful number, since it uses less digits than its factorization.

2001222221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826951362 (or 826951349 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 2001222221020 its reverse (201222221002), we get a palindrome (2202444442022).

The spelling of 2001222221020 in words is "two trillion, one billion, two hundred twenty-two million, two hundred twenty-one thousand, twenty".