1021220257 has 2 divisors, whose sum is σ = 1021220258. Its totient is φ = 1021220256.

The previous prime is 1021220143. The next prime is 1021220267. The reversal of 1021220257 is 7520221201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 978500961 + 42719296 = 31281^2 + 6536^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021220257 - 2⁷ = 1021220129 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021220267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510610128 + 510610129.

It is an arithmetic number, because the mean of its divisors is an integer number (510610129).

Almost surely, 2^1021220257 is an apocalyptic number.

It is an amenable number.

1021220257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021220257 is an equidigital number, since it uses as much as digits as its factorization.

1021220257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 1021220257 is about 31956.5369994935. The cubic root of 1021220257 is about 1007.0239673706.

Adding to 1021220257 its reverse (7520221201), we get a palindrome (8541441458).

The spelling of 1021220257 in words is "one billion, twenty-one million, two hundred twenty thousand, two hundred fifty-seven".