1021202021993 has 2 divisors, whose sum is σ = 1021202021994. Its totient is φ = 1021202021992.

The previous prime is 1021202021989. The next prime is 1021202022037. The reversal of 1021202021993 is 3991202021201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 969303259024 + 51898762969 = 984532^2 + 227813^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021202021993 - 2² = 1021202021989 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1021202021923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510601010996 + 510601010997.

It is an arithmetic number, because the mean of its divisors is an integer number (510601010997).

Almost surely, 2^{1021202021993} is an apocalyptic number.

It is an amenable number.

1021202021993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021202021993 is an equidigital number, since it uses as much as digits as its factorization.

1021202021993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 32.

The spelling of 1021202021993 in words is "one trillion, twenty-one billion, two hundred two million, twenty-one thousand, nine hundred ninety-three".