20100109993 has 2 divisors, whose sum is σ = 20100109994. Its totient is φ = 20100109992.

The previous prime is 20100109973. The next prime is 20100110033. The reversal of 20100109993 is 39990100102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16061253289 + 4038856704 = 126733^2 + 63552^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20100109993 is a prime.

It is not a weakly prime, because it can be changed into another prime (20100109973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050054996 + 10050054997.

It is an arithmetic number, because the mean of its divisors is an integer number (10050054997).

Almost surely, 2^20100109993 is an apocalyptic number.

It is an amenable number.

20100109993 is a deficient number, since it is larger than the sum of its proper divisors (1).

20100109993 is an equidigital number, since it uses as much as digits as its factorization.

20100109993 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 34.

The spelling of 20100109993 in words is "twenty billion, one hundred million, one hundred nine thousand, nine hundred ninety-three".