2120201202121 has 4 divisors (see below), whose sum is σ = 2121159270852. Its totient is φ = 2119243133392.

The previous prime is 2120201202029. The next prime is 2120201202139. The reversal of 2120201202121 is 1212021020212.

It is a happy number.

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 1938332217600 + 181868984521 = 1392240^2 + 426461^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120201202121 - 2²⁷ = 2120066984393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2120201202095 and 2120201202104.

It is not an unprimeable number, because it can be changed into a prime (2120201202181) 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, 479031046 + ... + 479035471.

It is an arithmetic number, because the mean of its divisors is an integer number (530289817713).

Almost surely, 2^{2120201202121} is an apocalyptic number.

It is an amenable number.

2120201202121 is a deficient number, since it is larger than the sum of its proper divisors (958068731).

2120201202121 is an equidigital number, since it uses as much as digits as its factorization.

2120201202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958068730.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2120201202121 its reverse (1212021020212), we get a palindrome (3332222222333).

It can be divided in two parts, 212020 and 1202121, that added together give a palindrome (1414141).

The spelling of 2120201202121 in words is "two trillion, one hundred twenty billion, two hundred one million, two hundred two thousand, one hundred twenty-one".