12102101112121 has 4 divisors (see below), whose sum is σ = 12813989412852. Its totient is φ = 11390212811392.

The previous prime is 12102101112119. The next prime is 12102101112151. The reversal of 12102101112121 is 12121110120121.

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 5129522874025 + 6972578238096 = 2264845^2 + 2640564^2 .

It is a cyclic number.

It is not a de Polignac number, because 12102101112121 - 2¹ = 12102101112119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12102101112095 and 12102101112104.

It is not an unprimeable number, because it can be changed into a prime (12102101112151) 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, 355944150340 + ... + 355944150373.

It is an arithmetic number, because the mean of its divisors is an integer number (3203497353213).

Almost surely, 2^{12102101112121} is an apocalyptic number.

It is an amenable number.

12102101112121 is a deficient number, since it is larger than the sum of its proper divisors (711888300731).

12102101112121 is an equidigital number, since it uses as much as digits as its factorization.

12102101112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711888300730.

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

Adding to 12102101112121 its reverse (12121110120121), we get a palindrome (24223211232242).

The spelling of 12102101112121 in words is "twelve trillion, one hundred two billion, one hundred one million, one hundred twelve thousand, one hundred twenty-one".