102240217 has 4 divisors (see below), whose sum is σ = 102291840. Its totient is φ = 102188596.

The previous prime is 102240161. The next prime is 102240241. The reversal of 102240217 is 712042201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102240217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102240194 and 102240203.

It is not an unprimeable number, because it can be changed into a prime (102240247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22717 + ... + 26842.

It is an arithmetic number, because the mean of its divisors is an integer number (25572960).

Almost surely, 2^102240217 is an apocalyptic number.

It is an amenable number.

102240217 is a deficient number, since it is larger than the sum of its proper divisors (51623).

102240217 is an equidigital number, since it uses as much as digits as its factorization.

102240217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51622.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 102240217 is about 10111.3904582901. The cubic root of 102240217 is about 467.5993737678.

Adding to 102240217 its reverse (712042201), we get a palindrome (814282418).

The spelling of 102240217 in words is "one hundred two million, two hundred forty thousand, two hundred seventeen".