2120122121 has 4 divisors (see below), whose sum is σ = 2283208452. Its totient is φ = 1957035792.

The previous prime is 2120122097. The next prime is 2120122141. The reversal of 2120122121 is 1212210212.

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 932630521 + 1187491600 = 30539^2 + 34460^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120122121 - 2¹⁰ = 2120121097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2120122096 and 2120122105.

It is not an unprimeable number, because it can be changed into a prime (2120122141) 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, 81543146 + ... + 81543171.

It is an arithmetic number, because the mean of its divisors is an integer number (570802113).

Almost surely, 2^2120122121 is an apocalyptic number.

It is an amenable number.

2120122121 is a deficient number, since it is larger than the sum of its proper divisors (163086331).

2120122121 is a wasteful number, since it uses less digits than its factorization.

2120122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163086330.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2120122121 is about 46044.7838631044. The cubic root of 2120122121 is about 1284.6563239846.

Adding to 2120122121 its reverse (1212210212), we get a palindrome (3332332333).

The spelling of 2120122121 in words is "two billion, one hundred twenty million, one hundred twenty-two thousand, one hundred twenty-one".