20021020212100 has 144 divisors (see below), whose sum is σ = 49216169963520. Its totient is φ = 7023563827200.

The previous prime is 20021020212091. The next prime is 20021020212101. The reversal of 20021020212100 is 121202012002.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20021020212101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3110404 + ... + 7051003.

It is an arithmetic number, because the mean of its divisors is an integer number (341778958080).

Almost surely, 2^{20021020212100} is an apocalyptic number.

20021020212100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021020212100 is an abundant number, since it is smaller than the sum of its proper divisors (29195149751420).

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

20021020212100 is a wasteful number, since it uses less digits than its factorization.

20021020212100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10161518 (or 10161511 counting only the distinct ones).

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

Adding to 20021020212100 its reverse (121202012002), we get a palindrome (20142222224102).

The spelling of 20021020212100 in words is "twenty trillion, twenty-one billion, twenty million, two hundred twelve thousand, one hundred".