20021100102020 has 12 divisors (see below), whose sum is σ = 42044310214284. Its totient is φ = 8008440040800.

The previous prime is 20021100101987. The next prime is 20021100102041. The reversal of 20021100102020 is 2020100112002.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6033036338176 + 13988063763844 = 2456224^2 + 3740062^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20021100101992 and 20021100102010.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500527502531 + ... + 500527502570.

It is an arithmetic number, because the mean of its divisors is an integer number (3503692517857).

Almost surely, 2^{20021100102020} is an apocalyptic number.

20021100102020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021100102020 is an abundant number, since it is smaller than the sum of its proper divisors (22023210112264).

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

20021100102020 is a wasteful number, since it uses less digits than its factorization.

20021100102020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001055005110 (or 1001055005108 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20021100102020 its reverse (2020100112002), we get a palindrome (22041200214022).

The spelling of 20021100102020 in words is "twenty trillion, twenty-one billion, one hundred million, one hundred two thousand, twenty".