212261742437189 has 2 divisors, whose sum is σ = 212261742437190. Its totient is φ = 212261742437188.

The previous prime is 212261742437179. The next prime is 212261742437287. The reversal of 212261742437189 is 981734247162212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209371205212225 + 2890537224964 = 14469665^2 + 1700158^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212261742437189 is a prime.

It is a super-2 number, since 2×212261742437189² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212261742437119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106130871218594 + 106130871218595.

It is an arithmetic number, because the mean of its divisors is an integer number (106130871218595).

Almost surely, 2^{212261742437189} is an apocalyptic number.

It is an amenable number.

212261742437189 is a deficient number, since it is larger than the sum of its proper divisors (1).

212261742437189 is an equidigital number, since it uses as much as digits as its factorization.

212261742437189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16257024, while the sum is 59.

The spelling of 212261742437189 in words is "two hundred twelve trillion, two hundred sixty-one billion, seven hundred forty-two million, four hundred thirty-seven thousand, one hundred eighty-nine".