20110121102101 has 4 divisors (see below), whose sum is σ = 20114134302304. Its totient is φ = 20106107901900.

The previous prime is 20110121102083. The next prime is 20110121102179. The reversal of 20110121102101 is 10120112101102.

It is a happy number.

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 20110121102101 - 2⁹ = 20110121101589 is a prime.

It is a super-2 number, since 2×20110121102101² (a number of 27 digits) contains 22 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 (20110121109101) 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, 2006592585 + ... + 2006602606.

It is an arithmetic number, because the mean of its divisors is an integer number (5028533575576).

Almost surely, 2^{20110121102101} is an apocalyptic number.

It is an amenable number.

20110121102101 is a deficient number, since it is larger than the sum of its proper divisors (4013200203).

20110121102101 is an equidigital number, since it uses as much as digits as its factorization.

20110121102101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4013200202.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 20110121102101 its reverse (10120112101102), we get a palindrome (30230233203203).

Subtracting from 20110121102101 its reverse (10120112101102), we obtain a palindrome (9990009000999).

It can be divided in two parts, 2011012 and 1102101, that added together give a palindrome (3113113).

The spelling of 20110121102101 in words is "twenty trillion, one hundred ten billion, one hundred twenty-one million, one hundred two thousand, one hundred one".