102120245 has 4 divisors (see below), whose sum is σ = 122544300. Its totient is φ = 81696192.

The previous prime is 102120203. The next prime is 102120301. The reversal of 102120245 is 542021201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 542021201 = 17099 ⋅31699.

It can be written as a sum of positive squares in 2 ways, for example, as 72624484 + 29495761 = 8522^2 + 5431^2 .

It is a cyclic number.

It is not a de Polignac number, because 102120245 - 2⁶ = 102120181 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10212020 + ... + 10212029.

It is an arithmetic number, because the mean of its divisors is an integer number (30636075).

Almost surely, 2^102120245 is an apocalyptic number.

It is an amenable number.

102120245 is a deficient number, since it is larger than the sum of its proper divisors (20424055).

102120245 is an equidigital number, since it uses as much as digits as its factorization.

102120245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20424054.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 102120245 is about 10105.4561994994. The cubic root of 102120245 is about 467.4164034040.

Adding to 102120245 its reverse (542021201), we get a palindrome (644141446).

The spelling of 102120245 in words is "one hundred two million, one hundred twenty thousand, two hundred forty-five".