207121 has 2 divisors, whose sum is σ = 207122. Its totient is φ = 207120.

The previous prime is 207113. The next prime is 207127. The reversal of 207121 is 121702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192721 + 14400 = 439^2 + 120^2 .

It is a cyclic number.

It is not a de Polignac number, because 207121 - 2³ = 207113 is a prime.

It is not a weakly prime, because it can be changed into another prime (207127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103560 + 103561.

It is an arithmetic number, because the mean of its divisors is an integer number (103561).

2²⁰⁷¹²¹ is an apocalyptic number.

It is an amenable number.

207121 is a deficient number, since it is larger than the sum of its proper divisors (1).

207121 is an equidigital number, since it uses as much as digits as its factorization.

207121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 207121 is about 455.1054822786. The cubic root of 207121 is about 59.1663408918.

Adding to 207121 its reverse (121702), we get a palindrome (328823).

The spelling of 207121 in words is "two hundred seven thousand, one hundred twenty-one", and thus it is an iban number.