210101201993 has 2 divisors, whose sum is σ = 210101201994. Its totient is φ = 210101201992.

The previous prime is 210101201977. The next prime is 210101202013. The reversal of 210101201993 is 399102101012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205909027984 + 4192174009 = 453772^2 + 64747^2 .

It is a cyclic number.

It is not a de Polignac number, because 210101201993 - 2⁴ = 210101201977 is a prime.

It is not a weakly prime, because it can be changed into another prime (210101201903) 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, 105050600996 + 105050600997.

It is an arithmetic number, because the mean of its divisors is an integer number (105050600997).

Almost surely, 2^210101201993 is an apocalyptic number.

It is an amenable number.

210101201993 is a deficient number, since it is larger than the sum of its proper divisors (1).

210101201993 is an equidigital number, since it uses as much as digits as its factorization.

210101201993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 29.

The spelling of 210101201993 in words is "two hundred ten billion, one hundred one million, two hundred one thousand, nine hundred ninety-three".