20021100101020 has 24 divisors (see below), whose sum is σ = 44257168645200. Its totient is φ = 7586943196032.

The previous prime is 20021100100997. The next prime is 20021100101029. The reversal of 20021100101020 is 2010100112002.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 20021100100988 and 20021100101006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021100101029) 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 7 ways as a sum of consecutive naturals, for example, 26343552385 + ... + 26343553144.

It is an arithmetic number, because the mean of its divisors is an integer number (1844048693550).

Almost surely, 2^{20021100101020} is an apocalyptic number.

20021100101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021100101020 is an abundant number, since it is smaller than the sum of its proper divisors (24236068544180).

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

20021100101020 is a wasteful number, since it uses less digits than its factorization.

20021100101020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52687105557 (or 52687105555 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20021100101020 its reverse (2010100112002), we get a palindrome (22031200213022).

The spelling of 20021100101020 in words is "twenty trillion, twenty-one billion, one hundred million, one hundred one thousand, twenty".