210210001993 has 2 divisors, whose sum is σ = 210210001994. Its totient is φ = 210210001992.

The previous prime is 210210001957. The next prime is 210210002111. The reversal of 210210001993 is 399100012012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150453221689 + 59756780304 = 387883^2 + 244452^2 .

It is a cyclic number.

It is not a de Polignac number, because 210210001993 - 2¹⁷ = 210209870921 is a prime.

It is not a weakly prime, because it can be changed into another prime (210210001193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105105000996 + 105105000997.

It is an arithmetic number, because the mean of its divisors is an integer number (105105000997).

Almost surely, 2^210210001993 is an apocalyptic number.

It is an amenable number.

210210001993 is a deficient number, since it is larger than the sum of its proper divisors (1).

210210001993 is an equidigital number, since it uses as much as digits as its factorization.

210210001993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 28.

The spelling of 210210001993 in words is "two hundred ten billion, two hundred ten million, one thousand, nine hundred ninety-three".