2120210221 has 2 divisors, whose sum is σ = 2120210222. Its totient is φ = 2120210220.

The previous prime is 2120210203. The next prime is 2120210227. The reversal of 2120210221 is 1220120212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1092302500 + 1027907721 = 33050^2 + 32061^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120210221 - 2¹¹ = 2120208173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120210227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060105110 + 1060105111.

It is an arithmetic number, because the mean of its divisors is an integer number (1060105111).

Almost surely, 2^2120210221 is an apocalyptic number.

It is an amenable number.

2120210221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120210221 is an equidigital number, since it uses as much as digits as its factorization.

2120210221 is an evil number, because the sum of its binary digits is even.

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

The square root of 2120210221 is about 46045.7405304769. The cubic root of 2120210221 is about 1284.6741180310.

Adding to 2120210221 its reverse (1220120212), we get a palindrome (3340330433).

Subtracting from 2120210221 its reverse (1220120212), we obtain a palindrome (900090009).

The spelling of 2120210221 in words is "two billion, one hundred twenty million, two hundred ten thousand, two hundred twenty-one".