2120211281 has 2 divisors, whose sum is σ = 2120211282. Its totient is φ = 2120211280.

The previous prime is 2120211263. The next prime is 2120211283. The reversal of 2120211281 is 1821120212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2117472256 + 2739025 = 46016^2 + 1655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2120211281 is a prime.

It is a super-2 number, since 2×2120211281² = 8990591752159321922, which contains 22 as substring.

Together with 2120211283, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2120211283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060105640 + 1060105641.

It is an arithmetic number, because the mean of its divisors is an integer number (1060105641).

Almost surely, 2^2120211281 is an apocalyptic number.

It is an amenable number.

2120211281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120211281 is an equidigital number, since it uses as much as digits as its factorization.

2120211281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 2120211281 is about 46045.7520407692. The cubic root of 2120211281 is about 1284.6743321221.

Adding to 2120211281 its reverse (1821120212), we get a palindrome (3941331493).

The spelling of 2120211281 in words is "two billion, one hundred twenty million, two hundred eleven thousand, two hundred eighty-one".