2021130257 has 2 divisors, whose sum is σ = 2021130258. Its totient is φ = 2021130256.

The previous prime is 2021130227. The next prime is 2021130259. The reversal of 2021130257 is 7520311202.

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., 1654943761 + 366186496 = 40681^2 + 19136^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021130257 - 2¹⁰ = 2021129233 is a prime.

Together with 2021130259, 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 (2021130259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010565128 + 1010565129.

It is an arithmetic number, because the mean of its divisors is an integer number (1010565129).

Almost surely, 2^2021130257 is an apocalyptic number.

It is an amenable number.

2021130257 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021130257 is an equidigital number, since it uses as much as digits as its factorization.

2021130257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 2021130257 is about 44956.9822941887. The cubic root of 2021130257 is about 1264.3425908096.

Adding to 2021130257 its reverse (7520311202), we get a palindrome (9541441459).

The spelling of 2021130257 in words is "two billion, twenty-one million, one hundred thirty thousand, two hundred fifty-seven".