20021100100109 has 4 divisors (see below), whose sum is σ = 20021133839616. Its totient is φ = 20021066360604.

The previous prime is 20021100100069. The next prime is 20021100100121. The reversal of 20021100100109 is 90100100112002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20021100100109 - 2²⁰ = 20021099051533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021100108109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15963419 + ... + 17171864.

It is an arithmetic number, because the mean of its divisors is an integer number (5005283459904).

Almost surely, 2^{20021100100109} is an apocalyptic number.

It is an amenable number.

20021100100109 is a deficient number, since it is larger than the sum of its proper divisors (33739507).

20021100100109 is an equidigital number, since it uses as much as digits as its factorization.

20021100100109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33739506.

The product of its (nonzero) digits is 36, while the sum is 17.

The spelling of 20021100100109 in words is "twenty trillion, twenty-one billion, one hundred million, one hundred thousand, one hundred nine".