207135121 has 2 divisors, whose sum is σ = 207135122. Its totient is φ = 207135120.

The previous prime is 207135119. The next prime is 207135151. The reversal of 207135121 is 121531702.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113742225 + 93392896 = 10665^2 + 9664^2 .

It is a cyclic number.

It is not a de Polignac number, because 207135121 - 2¹ = 207135119 is a prime.

Together with 207135119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 207135092 and 207135101.

It is not a weakly prime, because it can be changed into another prime (207135101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103567560 + 103567561.

It is an arithmetic number, because the mean of its divisors is an integer number (103567561).

Almost surely, 2^207135121 is an apocalyptic number.

It is an amenable number.

207135121 is a deficient number, since it is larger than the sum of its proper divisors (1).

207135121 is an equidigital number, since it uses as much as digits as its factorization.

207135121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 207135121 is about 14392.1895832427. The cubic root of 207135121 is about 591.6768546638.

Adding to 207135121 its reverse (121531702), we get a palindrome (328666823).

The spelling of 207135121 in words is "two hundred seven million, one hundred thirty-five thousand, one hundred twenty-one".