2101201212121 has 8 divisors (see below), whose sum is σ = 2293199532000. Its totient is φ = 1909366230240.

The previous prime is 2101201212109. The next prime is 2101201212157. The reversal of 2101201212121 is 1212121021012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2101201212121 - 2⁹ = 2101201211609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101201212095 and 2101201212104.

It is not an unprimeable number, because it can be changed into a prime (2101201212181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40807596 + ... + 40859053.

It is an arithmetic number, because the mean of its divisors is an integer number (286649941500).

Almost surely, 2^{2101201212121} is an apocalyptic number.

It is an amenable number.

2101201212121 is a deficient number, since it is larger than the sum of its proper divisors (191998319879).

2101201212121 is a wasteful number, since it uses less digits than its factorization.

2101201212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81668999.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2101201212121 its reverse (1212121021012), we get a palindrome (3313322233133).

It can be divided in two parts, 210120 and 1212121, that added together give a palindrome (1422241).

The spelling of 2101201212121 in words is "two trillion, one hundred one billion, two hundred one million, two hundred twelve thousand, one hundred twenty-one".