20101101210109 has 4 divisors (see below), whose sum is σ = 20101135930204. Its totient is φ = 20101066490016.

The previous prime is 20101101210107. The next prime is 20101101210193. The reversal of 20101101210109 is 90101210110102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5515217402500 + 14585883807609 = 2348450^2 + 3819147^2 .

It is a cyclic number.

It is not a de Polignac number, because 20101101210109 - 2¹ = 20101101210107 is a prime.

It is a super-3 number, since 3×20101101210109³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101101210101) 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, 16476642 + ... + 17654515.

It is an arithmetic number, because the mean of its divisors is an integer number (5025283982551).

Almost surely, 2^{20101101210109} is an apocalyptic number.

It is an amenable number.

20101101210109 is a deficient number, since it is larger than the sum of its proper divisors (34720095).

20101101210109 is an equidigital number, since it uses as much as digits as its factorization.

20101101210109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34720094.

The product of its (nonzero) digits is 36, while the sum is 19.

The spelling of 20101101210109 in words is "twenty trillion, one hundred one billion, one hundred one million, two hundred ten thousand, one hundred nine".