102042121289 has 2 divisors, whose sum is σ = 102042121290. Its totient is φ = 102042121288.

The previous prime is 102042121249. The next prime is 102042121339. The reversal of 102042121289 is 982121240201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99782069689 + 2260051600 = 315883^2 + 47540^2 .

It is a cyclic number.

It is not a de Polignac number, because 102042121289 - 2²⁴ = 102025344073 is a prime.

It is not a weakly prime, because it can be changed into another prime (102042121249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51021060644 + 51021060645.

It is an arithmetic number, because the mean of its divisors is an integer number (51021060645).

Almost surely, 2^102042121289 is an apocalyptic number.

It is an amenable number.

102042121289 is a deficient number, since it is larger than the sum of its proper divisors (1).

102042121289 is an equidigital number, since it uses as much as digits as its factorization.

102042121289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 32.

The spelling of 102042121289 in words is "one hundred two billion, forty-two million, one hundred twenty-one thousand, two hundred eighty-nine".