1012023231221 has 2 divisors, whose sum is σ = 1012023231222. Its totient is φ = 1012023231220.

The previous prime is 1012023231209. The next prime is 1012023231239. The reversal of 1012023231221 is 1221323202101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 878296980625 + 133726250596 = 937175^2 + 365686^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012023231221 - 2²⁶ = 1011956122357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1012023231193 and 1012023231202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1012023236221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506011615610 + 506011615611.

It is an arithmetic number, because the mean of its divisors is an integer number (506011615611).

Almost surely, 2^{1012023231221} is an apocalyptic number.

It is an amenable number.

1012023231221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012023231221 is an equidigital number, since it uses as much as digits as its factorization.

1012023231221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 1012023231221 its reverse (1221323202101), we get a palindrome (2233346433322).

The spelling of 1012023231221 in words is "one trillion, twelve billion, twenty-three million, two hundred thirty-one thousand, two hundred twenty-one".