102728437121 has 2 divisors, whose sum is σ = 102728437122. Its totient is φ = 102728437120.

The previous prime is 102728437073. The next prime is 102728437127. The reversal of 102728437121 is 121734827201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89436883600 + 13291553521 = 299060^2 + 115289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102728437121 is a prime.

It is not a weakly prime, because it can be changed into another prime (102728437127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51364218560 + 51364218561.

It is an arithmetic number, because the mean of its divisors is an integer number (51364218561).

Almost surely, 2^102728437121 is an apocalyptic number.

It is an amenable number.

102728437121 is a deficient number, since it is larger than the sum of its proper divisors (1).

102728437121 is an equidigital number, since it uses as much as digits as its factorization.

102728437121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37632, while the sum is 38.

The spelling of 102728437121 in words is "one hundred two billion, seven hundred twenty-eight million, four hundred thirty-seven thousand, one hundred twenty-one".