2101212120121 has 8 divisors (see below), whose sum is σ = 2185676929800. Its totient is φ = 2017547925120.

The previous prime is 2101212120107. The next prime is 2101212120127. The reversal of 2101212120121 is 1210212121012.

It can be written as a sum of positive squares in 4 ways, for example, as 202504500025 + 1898707620096 = 450005^2 + 1377936^2 .

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 2101212120121 - 2⁵ = 2101212120089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101212120095 and 2101212120104.

It is not an unprimeable number, because it can be changed into a prime (2101212120127) 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, 200148316 + ... + 200158813.

It is an arithmetic number, because the mean of its divisors is an integer number (273209616225).

Almost surely, 2^{2101212120121} is an apocalyptic number.

It is an amenable number.

2101212120121 is a deficient number, since it is larger than the sum of its proper divisors (84464809679).

2101212120121 is a wasteful number, since it uses less digits than its factorization.

2101212120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400307339.

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

Adding to 2101212120121 its reverse (1210212121012), we get a palindrome (3311424241133).

The spelling of 2101212120121 in words is "two trillion, one hundred one billion, two hundred twelve million, one hundred twenty thousand, one hundred twenty-one".