1301021021 has 2 divisors, whose sum is σ = 1301021022. Its totient is φ = 1301021020.

The previous prime is 1301021011. The next prime is 1301021039. The reversal of 1301021021 is 1201201031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1206172900 + 94848121 = 34730^2 + 9739^2 .

It is a cyclic number.

It is not a de Polignac number, because 1301021021 - 2²² = 1296826717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1301020993 and 1301021011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1301021011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 650510510 + 650510511.

It is an arithmetic number, because the mean of its divisors is an integer number (650510511).

Almost surely, 2^1301021021 is an apocalyptic number.

It is an amenable number.

1301021021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1301021021 is an equidigital number, since it uses as much as digits as its factorization.

1301021021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1301021021 is about 36069.6689893323. The cubic root of 1301021021 is about 1091.6785352270.

Adding to 1301021021 its reverse (1201201031), we get a palindrome (2502222052).

The spelling of 1301021021 in words is "one billion, three hundred one million, twenty-one thousand, twenty-one".