20021100212020 has 48 divisors (see below), whose sum is σ = 42621327821520. Its totient is φ = 7898537511936.

The previous prime is 20021100211967. The next prime is 20021100212051. The reversal of 20021100212020 is 2021200112002.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1875902772496 + 18145197439524 = 1369636^2 + 4259718^2 .

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, 67147026 + ... + 67444534.

It is an arithmetic number, because the mean of its divisors is an integer number (887944329615).

Almost surely, 2^{20021100212020} is an apocalyptic number.

20021100212020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021100212020 is an abundant number, since it is smaller than the sum of its proper divisors (22600227609500).

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

20021100212020 is a wasteful number, since it uses less digits than its factorization.

20021100212020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343684 (or 343682 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20021100212020 its reverse (2021200112002), we get a palindrome (22042300324022).

The spelling of 20021100212020 in words is "twenty trillion, twenty-one billion, one hundred million, two hundred twelve thousand, twenty".