1021011019993 has 2 divisors, whose sum is σ = 1021011019994. Its totient is φ = 1021011019992.

The previous prime is 1021011019969. The next prime is 1021011020119. The reversal of 1021011019993 is 3999101101201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 895799782089 + 125211237904 = 946467^2 + 353852^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021011019993 - 2⁹ = 1021011019481 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021011019933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510505509996 + 510505509997.

It is an arithmetic number, because the mean of its divisors is an integer number (510505509997).

Almost surely, 2^{1021011019993} is an apocalyptic number.

It is an amenable number.

1021011019993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021011019993 is an equidigital number, since it uses as much as digits as its factorization.

1021011019993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 37.

The spelling of 1021011019993 in words is "one trillion, twenty-one billion, eleven million, nineteen thousand, nine hundred ninety-three".