210220111993 has 2 divisors, whose sum is σ = 210220111994. Its totient is φ = 210220111992.

The previous prime is 210220111973. The next prime is 210220112041. The reversal of 210220111993 is 399111022012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193447789929 + 16772322064 = 439827^2 + 129508^2 .

It is a cyclic number.

It is not a de Polignac number, because 210220111993 - 2³⁷ = 72781158521 is a prime.

It is not a weakly prime, because it can be changed into another prime (210220111973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105110055996 + 105110055997.

It is an arithmetic number, because the mean of its divisors is an integer number (105110055997).

Almost surely, 2^210220111993 is an apocalyptic number.

It is an amenable number.

210220111993 is a deficient number, since it is larger than the sum of its proper divisors (1).

210220111993 is an equidigital number, since it uses as much as digits as its factorization.

210220111993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 31.

The spelling of 210220111993 in words is "two hundred ten billion, two hundred twenty million, one hundred eleven thousand, nine hundred ninety-three".