210338193781 has 2 divisors, whose sum is σ = 210338193782. Its totient is φ = 210338193780.

The previous prime is 210338193761. The next prime is 210338193797. The reversal of 210338193781 is 187391833012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190466780625 + 19871413156 = 436425^2 + 140966^2 .

It is a cyclic number.

It is not a de Polignac number, because 210338193781 - 2²⁹ = 209801322869 is a prime.

It is a super-2 number, since 2×210338193781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210338193701) 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, 105169096890 + 105169096891.

It is an arithmetic number, because the mean of its divisors is an integer number (105169096891).

Almost surely, 2^210338193781 is an apocalyptic number.

It is an amenable number.

210338193781 is a deficient number, since it is larger than the sum of its proper divisors (1).

210338193781 is an equidigital number, since it uses as much as digits as its factorization.

210338193781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 46.

The spelling of 210338193781 in words is "two hundred ten billion, three hundred thirty-eight million, one hundred ninety-three thousand, seven hundred eighty-one".