2120200021 has 2 divisors, whose sum is σ = 2120200022. Its totient is φ = 2120200020.

The previous prime is 2120200013. The next prime is 2120200039. The reversal of 2120200021 is 1200020212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1869611121 + 250588900 = 43239^2 + 15830^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120200021 - 2³ = 2120200013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2120199980 and 2120200007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120200091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060100010 + 1060100011.

It is an arithmetic number, because the mean of its divisors is an integer number (1060100011).

Almost surely, 2^2120200021 is an apocalyptic number.

It is an amenable number.

2120200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120200021 is an equidigital number, since it uses as much as digits as its factorization.

2120200021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2120200021 is about 46045.6297709131. The cubic root of 2120200021 is about 1284.6720579056.

Adding to 2120200021 its reverse (1200020212), we get a palindrome (3320220233).

The spelling of 2120200021 in words is "two billion, one hundred twenty million, two hundred thousand, twenty-one".