102180121 has 2 divisors, whose sum is σ = 102180122. Its totient is φ = 102180120.

The previous prime is 102180109. The next prime is 102180139. The reversal of 102180121 is 121081201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100220121 + 1960000 = 10011^2 + 1400^2 .

It is an emirp because it is prime and its reverse (121081201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102180121 - 2¹¹ = 102178073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102180095 and 102180104.

It is not a weakly prime, because it can be changed into another prime (102180721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51090060 + 51090061.

It is an arithmetic number, because the mean of its divisors is an integer number (51090061).

Almost surely, 2^102180121 is an apocalyptic number.

It is an amenable number.

102180121 is a deficient number, since it is larger than the sum of its proper divisors (1).

102180121 is an equidigital number, since it uses as much as digits as its factorization.

102180121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

The square root of 102180121 is about 10108.4183233580. The cubic root of 102180121 is about 467.5077387263.

The spelling of 102180121 in words is "one hundred two million, one hundred eighty thousand, one hundred twenty-one".