2020212121 has 2 divisors, whose sum is σ = 2020212122. Its totient is φ = 2020212120.

The previous prime is 2020212083. The next prime is 2020212169. The reversal of 2020212121 is 1212120202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1852872025 + 167340096 = 43045^2 + 12936^2 .

It is a cyclic number.

It is not a de Polignac number, because 2020212121 - 2²⁷ = 1885994393 is a prime.

It is not a weakly prime, because it can be changed into another prime (2020242121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010106060 + 1010106061.

It is an arithmetic number, because the mean of its divisors is an integer number (1010106061).

Almost surely, 2^2020212121 is an apocalyptic number.

It is an amenable number.

2020212121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2020212121 is an equidigital number, since it uses as much as digits as its factorization.

2020212121 is an odious number, because the sum of its binary digits is odd.

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

The square root of 2020212121 is about 44946.7698616931. The cubic root of 2020212121 is about 1264.1511114354.

Adding to 2020212121 its reverse (1212120202), we get a palindrome (3232332323).

It can be divided in two parts, 20202 and 12121, that multiplied together give a palindrome (244868442).

The spelling of 2020212121 in words is "two billion, twenty million, two hundred twelve thousand, one hundred twenty-one".