210442131397 has 2 divisors, whose sum is σ = 210442131398. Its totient is φ = 210442131396.

The previous prime is 210442131391. The next prime is 210442131437. The reversal of 210442131397 is 793131244012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145028442276 + 65413689121 = 380826^2 + 255761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210442131397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210442131391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105221065698 + 105221065699.

It is an arithmetic number, because the mean of its divisors is an integer number (105221065699).

Almost surely, 2^210442131397 is an apocalyptic number.

It is an amenable number.

210442131397 is a deficient number, since it is larger than the sum of its proper divisors (1).

210442131397 is an equidigital number, since it uses as much as digits as its factorization.

210442131397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 37.

The spelling of 210442131397 in words is "two hundred ten billion, four hundred forty-two million, one hundred thirty-one thousand, three hundred ninety-seven".