121242137 has 2 divisors, whose sum is σ = 121242138. Its totient is φ = 121242136.

The previous prime is 121242101. The next prime is 121242193. The reversal of 121242137 is 731242121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121242121 + 16 = 11011^2 + 4^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121242137 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121242437) 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, 60621068 + 60621069.

It is an arithmetic number, because the mean of its divisors is an integer number (60621069).

Almost surely, 2^121242137 is an apocalyptic number.

It is an amenable number.

121242137 is a deficient number, since it is larger than the sum of its proper divisors (1).

121242137 is an equidigital number, since it uses as much as digits as its factorization.

121242137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 23.

The square root of 121242137 is about 11011.0007265462. Note that the first 3 decimals coincide. The cubic root of 121242137 is about 494.9384503275.

Adding to 121242137 its reverse (731242121), we get a palindrome (852484258).

The spelling of 121242137 in words is "one hundred twenty-one million, two hundred forty-two thousand, one hundred thirty-seven".