126189065021 has 2 divisors, whose sum is σ = 126189065022. Its totient is φ = 126189065020.

The previous prime is 126189065011. The next prime is 126189065033. The reversal of 126189065021 is 120560981621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70603929796 + 55585135225 = 265714^2 + 235765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126189065021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 126189065021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126189065011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63094532510 + 63094532511.

It is an arithmetic number, because the mean of its divisors is an integer number (63094532511).

Almost surely, 2^126189065021 is an apocalyptic number.

It is an amenable number.

126189065021 is a deficient number, since it is larger than the sum of its proper divisors (1).

126189065021 is an equidigital number, since it uses as much as digits as its factorization.

126189065021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 41.

The spelling of 126189065021 in words is "one hundred twenty-six billion, one hundred eighty-nine million, sixty-five thousand, twenty-one".