102142217 has 2 divisors, whose sum is σ = 102142218. Its totient is φ = 102142216.

The previous prime is 102142177. The next prime is 102142247. The reversal of 102142217 is 712241201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72863296 + 29278921 = 8536^2 + 5411^2 .

It is a cyclic number.

It is not a de Polignac number, because 102142217 - 2⁸ = 102141961 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (102142247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51071108 + 51071109.

It is an arithmetic number, because the mean of its divisors is an integer number (51071109).

Almost surely, 2^102142217 is an apocalyptic number.

It is an amenable number.

102142217 is a deficient number, since it is larger than the sum of its proper divisors (1).

102142217 is an equidigital number, since it uses as much as digits as its factorization.

102142217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 102142217 is about 10106.5432765115. The cubic root of 102142217 is about 467.4499238117.

Adding to 102142217 its reverse (712241201), we get a palindrome (814383418).

The spelling of 102142217 in words is "one hundred two million, one hundred forty-two thousand, two hundred seventeen".