1021012002121 has 2 divisors, whose sum is σ = 1021012002122. Its totient is φ = 1021012002120.

The previous prime is 1021012002107. The next prime is 1021012002137. The reversal of 1021012002121 is 1212002101201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 870002042121 + 151009960000 = 932739^2 + 388600^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021012002121 - 2¹⁷ = 1021011871049 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021012002421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510506001060 + 510506001061.

It is an arithmetic number, because the mean of its divisors is an integer number (510506001061).

Almost surely, 2^{1021012002121} is an apocalyptic number.

It is an amenable number.

1021012002121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021012002121 is an equidigital number, since it uses as much as digits as its factorization.

1021012002121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1021012002121 its reverse (1212002101201), we get a palindrome (2233014103322).

The spelling of 1021012002121 in words is "one trillion, twenty-one billion, twelve million, two thousand, one hundred twenty-one".