1020021221993 has 2 divisors, whose sum is σ = 1020021221994. Its totient is φ = 1020021221992.

The previous prime is 1020021221983. The next prime is 1020021222041. The reversal of 1020021221993 is 3991221200201.

It is a happy number.

1020021221993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 866990041129 + 153031180864 = 931123^2 + 391192^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020021221993 - 2¹⁰ = 1020021220969 is a prime.

It is not a weakly prime, because it can be changed into another prime (1020021221903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510010610996 + 510010610997.

It is an arithmetic number, because the mean of its divisors is an integer number (510010610997).

Almost surely, 2^{1020021221993} is an apocalyptic number.

It is an amenable number.

1020021221993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020021221993 is an equidigital number, since it uses as much as digits as its factorization.

1020021221993 is an evil number, because the sum of its binary digits is even.

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

The spelling of 1020021221993 in words is "one trillion, twenty billion, twenty-one million, two hundred twenty-one thousand, nine hundred ninety-three".