2121120457 has 2 divisors, whose sum is σ = 2121120458. Its totient is φ = 2121120456.

The previous prime is 2121120403. The next prime is 2121120479. The reversal of 2121120457 is 7540211212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1961072656 + 160047801 = 44284^2 + 12651^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121120457 - 2¹⁹ = 2120596169 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121120557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060560228 + 1060560229.

It is an arithmetic number, because the mean of its divisors is an integer number (1060560229).

Almost surely, 2^2121120457 is an apocalyptic number.

It is an amenable number.

2121120457 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121120457 is an equidigital number, since it uses as much as digits as its factorization.

2121120457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 2121120457 is about 46055.6235111414. The cubic root of 2121120457 is about 1284.8579346039.

Adding to 2121120457 its reverse (7540211212), we get a palindrome (9661331669).

The spelling of 2121120457 in words is "two billion, one hundred twenty-one million, one hundred twenty thousand, four hundred fifty-seven".