1021100101993 has 4 divisors (see below), whose sum is σ = 1021161112708. Its totient is φ = 1021039091280.

The previous prime is 1021100101991. The next prime is 1021100101997. The reversal of 1021100101993 is 3991010011201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 506598027049 + 514502074944 = 711757^2 + 717288^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021100101993 - 2¹ = 1021100101991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021100101991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30480246 + ... + 30513727.

It is an arithmetic number, because the mean of its divisors is an integer number (255290278177).

Almost surely, 2^{1021100101993} is an apocalyptic number.

It is an amenable number.

1021100101993 is a deficient number, since it is larger than the sum of its proper divisors (61010715).

1021100101993 is an equidigital number, since it uses as much as digits as its factorization.

1021100101993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61010714.

The product of its (nonzero) digits is 486, while the sum is 28.

The spelling of 1021100101993 in words is "one trillion, twenty-one billion, one hundred million, one hundred one thousand, nine hundred ninety-three".