2120202121 has 8 divisors (see below), whose sum is σ = 2125598760. Its totient is φ = 2114813952.

The previous prime is 2120202053. The next prime is 2120202143. The reversal of 2120202121 is 1212020212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1477326096 + 642876025 = 38436^2 + 25355^2 .

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 2120202121 - 2¹¹ = 2120200073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2120202181) 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, 931641 + ... + 933913.

It is an arithmetic number, because the mean of its divisors is an integer number (265699845).

Almost surely, 2^2120202121 is an apocalyptic number.

It is an amenable number.

2120202121 is a deficient number, since it is larger than the sum of its proper divisors (5396639).

2120202121 is a wasteful number, since it uses less digits than its factorization.

2120202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4235.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2120202121 is about 46045.6525743745. The cubic root of 2120202121 is about 1284.6724820496.

Adding to 2120202121 its reverse (1212020212), we get a palindrome (3332222333).

The spelling of 2120202121 in words is "two billion, one hundred twenty million, two hundred two thousand, one hundred twenty-one".