12001221002101 has 4 divisors (see below), whose sum is σ = 12415056209100. Its totient is φ = 11587385795104.

The previous prime is 12001221002093. The next prime is 12001221002117. The reversal of 12001221002101 is 10120012210021.

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 10338629959876 + 1662591042225 = 3215374^2 + 1289415^2 .

It is a cyclic number.

It is not a de Polignac number, because 12001221002101 - 2³ = 12001221002093 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 (12001221002131) 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, 206917603456 + ... + 206917603513.

It is an arithmetic number, because the mean of its divisors is an integer number (3103764052275).

Almost surely, 2^{12001221002101} is an apocalyptic number.

It is an amenable number.

12001221002101 is a deficient number, since it is larger than the sum of its proper divisors (413835206999).

12001221002101 is an equidigital number, since it uses as much as digits as its factorization.

12001221002101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413835206998.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12001221002101 its reverse (10120012210021), we get a palindrome (22121233212122).

The spelling of 12001221002101 in words is "twelve trillion, one billion, two hundred twenty-one million, two thousand, one hundred one".