1011020321 has 2 divisors, whose sum is σ = 1011020322. Its totient is φ = 1011020320.

The previous prime is 1011020299. The next prime is 1011020327. The reversal of 1011020321 is 1230201101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 798910225 + 212110096 = 28265^2 + 14564^2 .

It is an emirp because it is prime and its reverse (1230201101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1011020321 - 2¹⁰ = 1011019297 is a prime.

It is not a weakly prime, because it can be changed into another prime (1011020327) 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, 505510160 + 505510161.

It is an arithmetic number, because the mean of its divisors is an integer number (505510161).

Almost surely, 2^1011020321 is an apocalyptic number.

It is an amenable number.

1011020321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011020321 is an equidigital number, since it uses as much as digits as its factorization.

1011020321 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 1011020321 is about 31796.5457400643. The cubic root of 1011020321 is about 1003.6600281840.

Adding to 1011020321 its reverse (1230201101), we get a palindrome (2241221422).

The spelling of 1011020321 in words is "one billion, eleven million, twenty thousand, three hundred twenty-one".