2121101210121 has 16 divisors (see below), whose sum is σ = 2926743344448. Its totient is φ = 1365346756800.

The previous prime is 2121101210099. The next prime is 2121101210159. The reversal of 2121101210121 is 1210121011212.

It is a happy number.

It is not a de Polignac number, because 2121101210121 - 2¹⁹ = 2121100685833 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121101210121.

It is not an unprimeable number, because it can be changed into a prime (2121101210621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72920650 + ... + 72949731.

It is an arithmetic number, because the mean of its divisors is an integer number (182921459028).

Almost surely, 2^{2121101210121} is an apocalyptic number.

It is an amenable number.

2121101210121 is a deficient number, since it is larger than the sum of its proper divisors (805642134327).

2121101210121 is a wasteful number, since it uses less digits than its factorization.

2121101210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145870552.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 2121101210121 its reverse (1210121011212), we get a palindrome (3331222221333).

The spelling of 2121101210121 in words is "two trillion, one hundred twenty-one billion, one hundred one million, two hundred ten thousand, one hundred twenty-one".