20123219993 has 2 divisors, whose sum is σ = 20123219994. Its totient is φ = 20123219992.

The previous prime is 20123219971. The next prime is 20123220001. The reversal of 20123219993 is 39991232102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17206355929 + 2916864064 = 131173^2 + 54008^2 .

It is a cyclic number.

It is not a de Polignac number, because 20123219993 - 2⁸ = 20123219737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20123219993.

It is not a weakly prime, because it can be changed into another prime (20123219953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061609996 + 10061609997.

It is an arithmetic number, because the mean of its divisors is an integer number (10061609997).

Almost surely, 2^20123219993 is an apocalyptic number.

It is an amenable number.

20123219993 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123219993 is an equidigital number, since it uses as much as digits as its factorization.

20123219993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 41.

The spelling of 20123219993 in words is "twenty billion, one hundred twenty-three million, two hundred nineteen thousand, nine hundred ninety-three".